Merge remote-tracking branch 'upstream/master'
removed unneeded code
new sign font (Pixel UniCode)
show sign text while typing it
glPolygonOffset for signs
changed sign key to ` (backtick)
working on kerning and word wrap for signs
added word wrap function
word wrapping on signs
keep text inside block
z-buffer sucks
Shift+Enter to put a newline
bug fix
don't split on hyphens
don't generate polygons for space characters
custom strtok_r implementation
updated screenshot
moved textures into subfolder
moved *.c and *.h files into src/ subfolder
moved screenshots into subfolder