Fixed build error
Adding proper credits for Niklas
tests: check parsing of "numbers" where string is expected
Fix relative executable path and wrong icon path in desktop file

Changed Exec=./trojita to Exec=trojita

Changed icon path to 64x64 directory

BUG: 332642
REVIEW: 117119
Installed into system locations, trojita can't be started

This fixes not looking in standard data locations for the installed qml
files. To fix this it first checks if main.qml exists in the current
source tree, if not then we get a list of standard data locations and
try to find main.qml and throw qFatal if can't be found.

BUG: 332639
REVIEW: 117109

Conflicts:
	src/Ubuntu/main.cpp
Move ThreadingMsgListModel to ImapAccess

REVIEW: 117127