use better icons

[chrisbra]

BTW: I noticed the Gui version of Vim tries to load bitmaps/vim.ico from the runtime path.

This directory doesn't seem to be created anywhere, so I added it to the Installer and also created in the source archive, so that when no installer is used the file should be there as well.

I tested this and the installer uses the newer/better looking icons.

closes #9930

[codecov]

Codecov Report

Merging #9931 (bb316fe) into master (20fb28b) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9931      +/-   ##
==========================================
- Coverage   81.89%   81.89%   -0.01%     
==========================================
  Files         167      167              
  Lines      187067   187067              
  Branches    42159    42159              
==========================================
- Hits       153198   153196       -2     
- Misses      21532    21534       +2     
  Partials    12337    12337              

Flag	Coverage Δ
huge-clang-none	82.31% <ø> (-0.01%)	⬇️
huge-gcc-none	82.64% <ø> (+<0.01%)	⬆️
huge-gcc-testgui	81.10% <ø> (-0.01%)	⬇️
huge-gcc-unittests	2.01% <ø> (ø)
linux	83.88% <ø> (-0.01%)	⬇️
mingw-x64-HUGE	0.00% <ø> (ø)
mingw-x64-HUGE-gui	77.15% <ø> (+<0.01%)	⬆️
windows	75.93% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/message.c	81.27% <0.00%> (-0.24%)	⬇️
src/term.c	73.31% <0.00%> (-0.16%)	⬇️
src/netbeans.c	73.04% <0.00%> (-0.08%)	⬇️
src/libvterm/src/state.c	89.56% <0.00%> (-0.07%)	⬇️
src/window.c	87.91% <0.00%> (-0.07%)	⬇️
src/terminal.c	78.09% <0.00%> (-0.03%)	⬇️
src/os_win32.c	57.05% <0.00%> (ø)
src/gui_w32.c	35.04% <0.00%> (+0.03%)	⬆️
src/channel.c	83.81% <0.00%> (+0.04%)	⬆️
src/gui.c	74.08% <0.00%> (+0.09%)	⬆️
... and 2 more

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