Increment And Save v1

Developed & tested under Xsi 7.5

After installing the addon, a new item ("Increment and Save")
will appear under the File menu in the main Menubar.

The Custom Command "ms_asxIncrementAndSave" is automatically
mapped to "Ctrl + Alt + Shift + S"

When the command is used:

- if the scene has NOT been already saved to disk, it will show
a simple dialog to save the scene in the active project path;

- if the scene has been already saved to disk, but its name
doesn't end with _v##, it will add a suffix, starting at 1
(ex. scene_v01.scn);

- if the scene has been already saved to disk, and its name
ends with _v##, it will increment the version number
(ex. scene_v01.scn -> scene_v02.scn -> scene_v03.scn -> etc. )