Renamed Vector > vertex in ASCII files
Tagged instance methods as const

Patch submitted by Tobias Vogel
Fixed up includes of header files

Removed unnecessary path (works in Qt 4 and Qt 5).

Patch submitted by Tobias Vogel
Converted ^2, ^3 and ° characters into their unicode representation

Patch submitted by Tobias Vogel
Converted screenshot file path to Latin1 instead of Ascii

Patch submitted by Tobias Vogel
Replaced Qt::WFlags by Qt::WindowFlags

In Qt4, Qt::WFlags has been replaced by Qt::WindowFlags.

Patch submitted by Tobias Vogel