Many changes, see long description

- settings object now keeps all the settings, and is globably accessable
- Version numbering changed. Major and minor follow the T&S version A&P
works with. The final number is 'build' version
- Added a checkbox qml item
- Added checkboxes to enable or disable save games (GUI done, but code
is still TODO)
- Moved SavedDirectory variable to Settings, from SaveAccess, and,
hopefully, simplified SaveAccess and related GUI
- Fixed a bug with modifier keys and mouse clicks on resource "-" and
"+" buttons
- Cleaned up SettingsDisplay qml code
- Got pissed off, and almost gave up after halve a day with the id
variable in our lists... then spotted my error. Commented accordingly :)
- Changed the code to store directory path, instead of full path to
saves.sav, in preperation for the checkboxes in openfiledialog :)
- Think that's it... Ohh, speeld lik a pro, everywhere :)
Forgot to add main.h to the .pro file!