Fixes the `'\1' is not recognized as an internal or external command`
error when trying to run the target `update-pot` with MSBuild.
The `|` characters probably messed with cmd.exe or PowerShell syntax
rules so they were replaced with slashes `/`.
Also, at least some implementations of sed for Windows would produce
CRLF line endings instead of LF line endings. The issue is fixed by
adding the flag `-b`.
* localename library is now used to determine the actual locale used
* added patched version of FindGettext.cmake to fix
installation path of translation files
* targets are now created in top-level build directory
* more things are now configured through CMake options
* changed debug build detection from NDEBUG to DEV_BUILD
* moved po and desktop directories
* moved last unit test out of src directory
MrSimbax