Added bash versions of all the map preparing and merging scripts in 'tools/mapmerge2/'. (#6929)

* Added bash versions of all the map preparing and merging scripts in 'tools/mapmerge2/'.

* Renamed all Linux map preparation bash scripts.

* All Linux map preparation bash scripts now assume the file is being executed from the mapmerge2 directory, making the same assumption the .bat files make.

* The map merge Linux bash script now assumes the script is being run from the mapmerge2 directory, making the same assumption the .bat file makes.

html/changelogs/CodePanter-mapmerge-linux-support.html

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+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes: 
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.  
+author: CodePanter
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes: 
+  - backend: "Added bash versions of all the map preparing and merging scripts in 'tools/mapmerge2/'."

tools/mapmerge2/PrepareMaps-Aurora.sh

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+cd ../../maps/aurora
+
+for f in *.dmm; do
+    cp -- "$f" "${f%.dmm}.dmm.backup"
+done
+
+echo "All dmm files in the maps/aurora directory have been backed up."
+echo "Now you can make your changes."
+echo "---"
+echo "Remember to run mapmerge.sh just before you commit your changes!"
+echo "---"

tools/mapmerge2/PrepareMaps-Exodus.sh

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+cd ../../maps/exodus
+
+for f in *.dmm; do
+    cp -- "$f" "${f%.dmm}.dmm.backup"
+done
+
+echo "All dmm files in the maps/exodus directory have been backed up."
+echo "Now you can make your changes."
+echo "---"
+echo "Remember to run mapmerge.sh just before you commit your changes!"
+echo "---"

tools/mapmerge2/PrepareMaps-RandomDungeons.sh

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+cd ../../maps/dungeon_spawns
+
+for f in *.dmm; do
+    cp -- "$f" "${f%.dmm}.dmm.backup"
+done
+
+echo "All dmm files in the maps/dungeon_spawns directory have been backed up."
+echo "Now you can make your changes."
+echo "---"
+echo "Remember to run mapmerge.sh just before you commit your changes!"
+echo "---"

tools/mapmerge2/PrepareMaps-Runtime.sh

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+cd ../../maps/runtime
+
+for f in *.dmm; do
+    cp -- "$f" "${f%.dmm}.dmm.backup"
+done
+
+echo "All dmm files in the maps/runtime directory have been backed up."
+echo "Now you can make your changes."
+echo "---"
+echo "Remember to run mapmerge.sh just before you commit your changes!"
+echo "---"

tools/mapmerge2/PrepareMaps-SpaceRuins.sh

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+cd ../../maps/space_ruins
+
+for f in *.dmm; do
+    cp -- "$f" "${f%.dmm}.dmm.backup"
+done
+
+echo "All dmm files in the maps/space_ruins directory have been backed up."
+echo "Now you can make your changes."
+echo "---"
+echo "Remember to run mapmerge.sh just before you commit your changes!"
+echo "---"

tools/mapmerge2/mapmerge.sh

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+export MAPROOT="../../maps/aurora/"
+export TGM="1"
+python3 mapmerge.py
+
+cd ../../maps/aurora
+
+for f in *.dmm; do
+    unix2dos $f
+done