Fix colorization of markdown links and inlines inside of lists and quotes

Issue #12344

**Bug**
Current colorization rules are too relaxed. Links inside lists of block quotes for example end up getting colored differently than normal links.

**Fix**
- Add a scope to the textmate markdown grammar so that we can identify the symbol that starts a list or quote.
- Remove text colorization rule for lists and quotes since this just duplicates the normal text color.
- Only apply special puctuator colorization to the start symbol for lists and quotes

extensions/markdown/syntaxes/markdown.tmLanguage

@@ -222,7 +222,7 @@
 						<key>2</key>
 						<dict>
 							<key>name</key>
-							<string>punctuation.definition.quote.markdown</string>
+							<string>beginning.punctuation.definition.quote.markdown</string>
 						</dict>
 					</dict>
 					<key>name</key>
@@ -436,7 +436,7 @@
 								<key>3</key>
 								<dict>
 									<key>name</key>
-									<string>punctuation.definition.list.markdown</string>
+									<string>beginning.punctuation.definition.list.markdown</string>
 								</dict>
 							</dict>
 							<key>comment</key>
@@ -465,7 +465,7 @@
 								<key>3</key>
 								<dict>
 									<key>name</key>
-									<string>punctuation.definition.list.markdown</string>
+									<string>beginning.punctuation.definition.list.markdown</string>
 								</dict>
 							</dict>
 							<key>name</key>

extensions/theme-defaults/themes/dark_vs.json

@@ -137,23 +137,17 @@
 			}
 		},
 		{
-			"scope": "markup.punctuation.quote",
+			"scope": "markup.punctuation.quote.beginning",
 			"settings": {
 				"foreground": "#608b4e"
 			}
 		},
 		{
-			"scope": "markup.punctuation.list",
+			"scope": "markup.punctuation.list.beginning",
 			"settings": {
 				"foreground": "#6796e6"
 			}
 		},
-		{
-			"scope": ["markup.quote", "markup.list"],
-			"settings": {
-				"foreground": "#d4d4d4"
-			}
-		},
 		{
 			"scope": "markup.inline.raw",
 			"settings": {

extensions/theme-defaults/themes/light_plus.json

@@ -48,12 +48,6 @@
 			"settings": {
 				"foreground": "#001080"
 			}
-		},
-		{
-			"scope": ["markup.quote", "markup.list"],
-			"settings": {
-				"foreground": "#0451a5"
-			}
 		}
 	]
 }
\ No newline at end of file

extensions/theme-defaults/themes/light_vs.json

@@ -128,17 +128,11 @@
 			}
 		},
 		{
-			"scope": ["markup.punctuation.quote", "markup.punctuation.list"],
+			"scope": ["markup.punctuation.quote.beginning", "markup.punctuation.list.beginning"],
 			"settings": {
 				"foreground": "#0451a5"
 			}
 		},
-		{
-			"scope": ["markup.quote", "markup.list"],
-			"settings": {
-				"foreground": "#000000"
-			}
-		},
 		{
 			"scope": "markup.inline.raw",
 			"settings": {