MinGW / MSYS packages

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Try again to add support for MinGW / MSYS packages.

The following operations need to be implemented:

• check if installed
• install
• uninstall

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Every package can have multiple components (bin, man, doc, dev, ...).
An app property Components should list the required packages.
The default value of Components should be bin.

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• Check if installed: mingw-get list <package name> parse for Installed Version
• Install: mingw-get install <package name>-<component> optional with version or version range
• Uninstall: mingw-get remove <package name>

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Version Bounds (for install or upgrade actions):

{>|>=|=|<=|<}major[.minor[.rev]][-subsystem-major[.minor[.rev]]]:
"gcc=4.5.*"       Latest available release of GCC version 4.5.x
"gcc<4.6"         Alternative representation for GCC version 4.5.x