games/scummvm-tools: Update to 2.0.0

• Use PORTVERSION instead of DISTVERSION
• Update MASTER_SITES
• Add LICENSE_FILE
• Add missing dependencies
• Add USES=iconv
• Add DESKTOP_ENTRIES
• Install more DOCS
• Pet portlint

Noteworthy changes:

2.0.0 (2017-12-17)

• Fix handling of output path for the compress_touche tool.
• Fix handling of input path for the extract_cine tool. It was only working when run from the directory that contains the game data.
• Fix memory corruption that could cause random errors during extraction when using the extract_cine tool.

1.9.0 (2016-10-27)

• Fix random crashes in the tool to convert Broken Sword 1 speech files.

PR: 228880
Submitted by: cpm
Approved by: lme (maintainer)