Capitalized all remaining uncapitalized tooltips.
+ Fixed typo in instantiate() function. Shouldn't have any repercussions on the code, AFAICT.
+ other typos
+ some are doxy others are just comment code.
+ some minor whitespace and grammatical tweaks.
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.
