editor changes and vsync modification
- entity positioning in the editor’s entity chooser window no longer relies on x and y coordinates from the editor.xml file; positions are chosen based on a first-come first-serve basis, based on the size of the chooser window
- modified some strings with regards to the output of console messages
- added new console variable s_verticalSync which controls the synchronization of frame changes, provided that the WGL_EXT_swap_control OpenGL extension exists on the video card
- added new console variable g_saveLevelCount which increments by 1 every time the user saves a level; this value is used with g_saveLevel to create a unique filename
