Add balance changelog tag (#2736)

Adds a balance tag to the changelog system, for marking purely balance changes.

.travis.yml

@@ -40,7 +40,7 @@ script:
   - (num=`grep -E '\\\\(red|blue|green|black|b|i[^mc])' **/*.dm | wc -l`; echo "$num escapes (expecting ${MACRO_COUNT} or less)"; [ $num -le ${MACRO_COUNT} ])
   - awk -f tools/indentation.awk **/*.dm
   - md5sum -c - <<< "0af969f671fba6cf9696c78cd175a14a *baystation12.int"
-  - md5sum -c - <<< "88490b460c26947f5ec1ab1bb9fa9f17 *html/changelogs/example.yml"
+  - md5sum -c - <<< "94c0d540b3b0f008fbc4353e667de690 *html/changelogs/example.yml"
   - python tools/TagMatcher/tag-matcher.py ../..
   - python tools/GenerateChangelog/ss13_genchangelog.py html/changelog.html html/changelogs --dry-run
   - source $HOME/BYOND-${BYOND_MAJOR}.${BYOND_MINOR}/byond/bin/byondsetup

code/modules/client/asset_cache.dm

@@ -207,6 +207,7 @@ var/list/asset_datums = list()
 		"wrench-screwdriver.png" = 'html/wrench-screwdriver.png',
 		"spell-check.png" = 'html/spell-check.png',
 		"burn-exclamation.png" = 'html/burn-exclamation.png',
+		"scales.png" = 'html/scales.png',
 		"chevron.png" = 'html/chevron.png',
 		"chevron-expand.png" = 'html/chevron-expand.png',
 		"changelog.css" = 'html/changelog.css',

html/changelog.css

@@ -21,6 +21,7 @@ a img {border:none;}
 .spellcheck {background-image:url(spell-check.png)}
 .experiment {background-image:url(burn-exclamation.png)}
 .maptweak {background-image:url(map-pencil.png)}
+.balance {background-image:url(scales.png)}
 .sansserif {font-size:12px;}
 .commit {
 	margin-bottom:20px;

html/changelogs/example.yml

@@ -19,6 +19,7 @@
 #   maptweak
 #   spellcheck (typo fixes)
 #   experiment
+#   balance
 #################################
 
 # Your name.  

tools/GenerateChangelog/ss13_genchangelog.py

@@ -61,7 +61,8 @@ validPrefixes = [
     'imagedel',
     'maptweak',
     'spellcheck',
-    'experiment'
+    'experiment',
+    'balance'
 ]