Rename main.cpp to Main.cpp

--HG--
rename : src/engine/main.cpp => src/engine/Main.cpp
Fix case
Initial version of bootstrapper; no UI customization

--HG--
extra : rebase_source : e40e905f713bad93afa814eccc680bbcbc1da8db
Bootstrapper with UI. Localizable.

--HG--
extra : rebase_source : c613cbea612a7375d43f8a83b4f6e4368ee89d38
Modifications to bootstrapper after code review
* * *
extras for bootstrapper

--HG--
extra : rebase_source : 5ab3b4bec7fc9b5502a9ba4cd86ea4898a544cd7
Make the engine compile again

--HG--
extra : rebase_source : 40e9465989b3dc1953f4e4edc2173c1903fbccce