lang/seed7: update to 05_20210106

Changelog:

• The declaration of in-parameters has been changed to work the same way as all other parameter declarations (val-, ref-, inout-, attr- and in-var-parameters). Many thanks go to Zachary Menzies for pointing out a problem with in-parameters and for providing a test program. The new in-parameters fix this problem.
• The support for function types (func aType and proc) in interpreter and compiler has been improved.
• The support for Emscripten (a C compiler that generates JavaScript and WebAssembly) has been improved. The support of Emscripten is experimental (see also src/read_me.txt).
• The library http_response.s7i has been improved to set the correct content-type for more file types (css, javascript, wasm, gif, bmp, pdf). This way the comanche webserver also works better.
• The function getCgiParameters() in cgi.s7i has been improved to accept also elements wihout equals sign (in this case value is assumed to be "").
• The function readPropertyFile8() has been added to the library propertyfile.s7i. This function processes an UTF-8 encoded property file.
• In propertyfile.s7i the function readPropertyNameOrValue() has been changed to work correct for unicode escapes (\u) and for escaped newlines. An extended unicode escape (\U) has been added also.
• Testcases that check if seek() does clear the EOF flag have been added to chkfil.sd7.
• The Seed7 parser (used by interpreter and compiler) has been improved, to recognize if the same syntax is declared twice. In this case a compile-time error is written.
• The FAQ has been improved to explain the simple profiling of the Seed7 compiler.
• The simple profiling of the compiler has been improved to recognize, if a function has been left without taking profiling into account.
• The compiler has been improved to recognize if a raise statement leaves a function and generates code to make the profiling work correct (if it has been enabled).
• The recognition of constant expressions in the compiler has been improved to consider variable functions as variable. The changes are in comp/const.s7i in two functions named isConstantCall().
• Changes have been done in seed7_05.s7i and integer.s7i such that the new in-parameters work as expected.
• The interpreter has been improved to support the actions DCL_IN1, DCL_IN2, TYP_SET_IN_PARAM_REF and TYP_SET_IN_PARAM_VALUE.
• The functions dcl_in1() and dcl_in2() have been added to dcllib.c.
• The functions typ_set_in_param_ref() and typ_set_in_param_value() have been added to typlib.c.
• Changes in syntax.c and token.c make sure that the new error SYNTAX_DECLARED_TWICE is recognized.
• In prclib.c the function prc_cpy() has been improved to take into account that MATCHOBJECT is constant (and the underlaying object is variable).
• In cmd_unx.c the function setenv7() has been improved to work correct, if a value is enlarged.
• In cmd_unx.c the functions getenv7(), setenv7() and unsetenv7() have been improved to optionally work case insensitive.
• Changes in cmd_drv.h, cmd_rtl.c and fil_unx.c allow that some operating system properties are determined at run-time. This is used for Emscripten.
• The functions setenvForNodeJs() and unsetenvForNodeJs() have been added to cmd_unx.c. Now setenv() and unsetenv() have also an effect on the environment used by Node.
• The file drw_emc.c has been added. This file provides graphic access using browser capabilities. It is used if Seed7 is compiled with emcc.
• The file pre_js.js has been added. This JavaScript code is included by Emscripten. It sets up program path and arguments, if the program runs in the browser.
• In cmd_rtl.c the function systemForNodeJs() has been improved to return -1, if the command cannot be executed.
• The makefiles mk_emccl.mak and mk_emccw.mak have been improved to store the environment variables in seed7/bin/emcc_env.ini. The macro CC_ENVIRONMENT_INI, which defines the path of seed7/bin/emcc_env.ini, is now written to version.h. This way the Seed7 compiler can be used without setting up Emscripten.
• Changes have been done in error.c and error.h to introduce the new errors SYNTAX_DECLARED_TWICE and KIND_OF_IN_PARAM_UNDEFINED. The error UNEXPECTED_SYMBOL has been replaced with EXPECTED_SYMBO.
• The functions increaseLevelOfCatchedExceptions() and decreaseLevelOfCatchedExceptions() have been added to comp/error.s7i. These functions are used in comp/prc_act.s7i.
• In comp/expr.s7i the function declare_type_if_necessary() has been improved to take a existing typeCategory of BLOCKOBJECT into account.
• In comp/type.s7i the function getExprResultType() has been improved to check that the category is a CALLOBJECT.
• Definitions of LINKER_OPT_SPECIAL_LIB and SPECIAL_LIB have been added to cc_conf.s7i.
• The files s7c.sd7, confval.sd7, cmd_rtl.c, mk_emccl.mak and mk_emccw.mak have been improved to use the new configuration values.
• The parameter list of the functions cmdSetGroup() and cmdSetOwner() has been changed in comp/cmd_act.s7i, cmd_drv.h, cmd_unx.c and cmd_win.c. Now group and owner are constant strings.
• Documentation comments have been added or improved in cc_conf.s7i, cgi.s7i, csv.s7i, propertyfile.s7i and graph.s7i.