Add FreeDesktop config files for native support in graphical desktop environments

[dylwhich]

Description

Adds a FreeDesktop .desktop file for the Linux emulator, and a script to be included with the emulator download that handles installing it and its related files.

Test Instructions

It works on my machine! The install script should work if you run it from the download (with swadge_emulator, icon.png, and SwadgeEmulator.desktop), the repository root, or the emulator/resources directory inside the repository. If you try to run it from somewhere else it should complain about the files and give you a hint to fix it, and exit without doing anything else. Installing to alternate locations, e.g. /usr/local, should work and instructions are included in the emulator docs. On probably most Linux desktop environments (tested on Gnome), after installing you can right-click a MIDI file and use "Open with..." to play the file, and even set it as the default application for MIDI files.

Ticket Links

Readiness Checklist

• I have run make format to format the changes
• I have compiled the firmware and the changes have no warnings
• I have compiled the emulator and the changes have no warnings
• I have run make cppcheck and checked that cppcheck_result.txt has no warnings for the changes
• I have added doxygen comments to any code used by more than one Swadge mode. This includes /*! \file comments with Design Philosophy, Usage, and Example sections for new headers.
• I have run make docs and checked that doxy_warnings.txt has no warnings for the new code

[AEFeinstein]

Works on my ubuntu box too!

[AEFeinstein]

I'm getting rid of set -x and merging. Turns out

+ '[' -e swadge_emulator ']'
+ '[' -e ../../swadge_emulator ']'
+ BIN_SRC=../../swadge_emulator
+ '[' -e SwadgeEmulator.desktop ']'
+ DESKTOP_SRC=SwadgeEmulator.desktop
+ '[' -e icon.png ']'
+ ICON_SRC=icon.png
+ INSTALL_DIR=/root/.local
+ '[' 1 -gt 0 ']'
+ INSTALL_DIR=/usr/local/
+ echo 'Installing the Swadge Emulator to: /usr/local/'
Installing the Swadge Emulator to: /usr/local/
+ mkdir -p /usr/local//bin /usr/local//share/icons/SwadgeEmulator /usr/local//share/applications
+ cp ../../swadge_emulator /usr/local//bin/swadge_emulator
+ cp icon.png /usr/local//share/icons/SwadgeEmulator/icon.png
+ sed 's,$ROOT,/usr/local/,g' SwadgeEmulator.desktop
+ [[ :/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin: == *\:\/\u\s\r\/\l\o\c\a\l\/\/\b\i\n\:* ]]
+ echo 'WARNING: /usr/local//bin is not in your PATH!'
WARNING: /usr/local//bin is not in your PATH!
+ echo '    If you want to be able to start the Swadge Emulator from the command-line,'
    If you want to be able to start the Swadge Emulator from the command-line,
+ echo '    you can run this command to update your PATH for this session,'
    you can run this command to update your PATH for this session,
+ echo '    or add it to a file like ~/.bash_profile:'
    or add it to a file like ~/.bash_profile:
+ echo

+ echo '        export PATH="$PATH:/usr/local//bin"'
        export PATH="$PATH:/usr/local//bin"
+ echo

+ echo

+ echo 'Installation complete!'
Installation complete!

is a little messier and confusing than

Installing the Swadge Emulator to: /usr/local/
WARNING: /usr/local//bin is not in your PATH!
    If you want to be able to start the Swadge Emulator from the command-line,
    you can run this command to update your PATH for this session,
    or add it to a file like ~/.bash_profile:

        export PATH="$PATH:/usr/local//bin"


Installation complete!