Create fixed property `install.directory`

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Is your feature request related to a problem? Please describe.
The property install.directory does not exists. The closest we have is doing something like ${application.directory}\.. which is weird.

Describe the solution you'd like
Define property install.directory as the directory where ShellAnything is installed.

Describe alternatives you've considered
N/A

Additional context
N/A

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Property application.install.directory already exists but is undocumented. It will be added to documentation.