v0.4.0

pack: Update win32 nsis script

* CMakeLists.txt: Likewise.
* src/core/CMakeLists.txt: Likewise.
* src/gui/CMakeLists.txt: Likewise.
* src/gui/images/nclcomposer.rc -> src/gui/nclcomposer.rc: Renamed.
* win32-nsis/nclcomposer.nsis -> win32-nsis/nclcomposer.nsi: Renamed.

v0.3.0

[build] Minor changes in 0.3.0 relnotes.

* doc/relnotes/0.3.0.md: Likewise.