fix(developer): Show full version number

Updated various places in Keyman Developer to show the full
VersionWithTag rather than the short version number we had been
previously showing:

- About dialog
- Welcome screen
- Installer
- kmcomp help
- kmconvert help
- kmanalyze help
- kmdecomp help

This should help when testing to verify that we are testing the right
version.

Also fixed the keymansentry path when running command line C++ programs
from source repo.