Add/fix incorrect or missing language colours (github-linguist#4980)

* Abolish restrictions governing colour choices

* Add/fix incorrect or missing language colours

Resolves: github-linguist#4506

Co-authored-by: Colin Seymour <colin@github.com>

lib/linguist/languages.yml

@@ -294,6 +294,7 @@ ApacheConf:
   language_id: 16
 Apex:
   type: programming
+  color: "#1797c0"
   extensions:
   - ".cls"
   tm_scope: source.java
@@ -365,7 +366,7 @@ Assembly:
   language_id: 24
 Asymptote:
   type: programming
-  color: "#4a0c0c"
+  color: "#ff0000"
   extensions:
   - ".asy"
   interpreters:
@@ -668,6 +669,7 @@ COLLADA:
   language_id: 49
 CSON:
   type: data
+  color: "#244776"
   tm_scope: source.coffee
   ace_mode: coffee
   codemirror_mode: coffeescript
@@ -1344,7 +1346,7 @@ Edje Data Collection:
   language_id: 342840478
 Eiffel:
   type: programming
-  color: "#946d57"
+  color: "#4d6977"
   extensions:
   - ".e"
   tm_scope: source.eiffel
@@ -1928,7 +1930,7 @@ Grammatical Framework:
   - gf
   extensions:
   - ".gf"
-  color: "#79aa7a"
+  color: "#ff0000"
   tm_scope: source.gf
   ace_mode: haskell
   codemirror_mode: haskell
@@ -3162,6 +3164,7 @@ Mako:
   language_id: 221
 Markdown:
   type: prose
+  color: "#083fa1"
   aliases:
   - pandoc
   ace_mode: markdown
@@ -4192,6 +4195,7 @@ PowerShell:
   language_id: 293
 Prisma:
   type: data
+  color: "#0c344b"
   extensions:
   - ".prisma"
   tm_scope: source.prisma
@@ -4992,6 +4996,7 @@ STON:
   language_id: 336
 SVG:
   type: data
+  color: "#ff9900"
   extensions:
   - ".svg"
   tm_scope: text.xml.svg
@@ -5284,7 +5289,7 @@ Solidity:
   language_id: 237469032
 SourcePawn:
   type: programming
-  color: "#5c7611"
+  color: "#f69e1d"
   aliases:
   - sourcemod
   extensions:
@@ -5759,7 +5764,7 @@ UrWeb:
   language_id: 383
 V:
   type: programming
-  color: "#5d87bd"
+  color: "#4f87c4"
   aliases:
   - vlang
   extensions:
@@ -6284,6 +6289,7 @@ Xtend:
   language_id: 406
 YAML:
   type: data
+  color: "#cb171e"
   tm_scope: source.yaml
   aliases:
   - yml
@@ -6469,7 +6475,7 @@ fish:
   language_id: 415
 mIRC Script:
   type: programming
-  color: "#926059"
+  color: "#3d57c3"
   extensions:
   - ".mrc"
   tm_scope: source.msl