Change installer to allow client-gli installations

[oranfry]

Plan B: Scrap the idea of a client-gli distribution, and add options to the main installer to allow the user to install just client-gli if they want to. To achieve this, create a new page in the installer interview with two check-boxes:

Do you want to:
[ ] Build collections locally?
[ ] Build collections remotely?

(Please correct the following as necessary!)

If neither option is checked, install only runtime system.

If only "locally" is checked, install everything but don't link client-gli script on the start menu.

If only "remotely" is checked, this is the client-gli installation. Install gli and gs2build, and runtime system for local previewing. Link only remote-gli on the start menu.

If both are checked, install everything and link gli and remote-gli on the start menu.

[oranfry]

Client GLI:

• gli
• wget in gli/bin/OS

Client FLI: As above plus,

• gs2build
• collect
• some of etc
• mappings

[ak19]

See #514

[oranfry]

This was Plan A:

Create an installer for client-gli. This will help in enabling the download panel in client-gli.

Client GLI:

• gli
• wget in gli/bin/OS

Client FLI:

• gli (renamed to FLI)
• gs2build
• collect
• etc (subset of files)
• mappings