Use new syntax highlighting engine from zyedidia/highlight

This changes all the syntax files in the runtime directory and also
changes how syntax highlighting is done from inside micro.

runtime/syntax/toml.yaml

@@ -0,0 +1,39 @@
+filetype: toml
+
+detect:
+    filename: "\\.toml"
+
+rules:
+    - statement: "(.*)[[:space:]]="
+    - special: "="
+
+      # Bracket thingies
+    - special: "(\\[|\\])"
+
+      # Numbers and strings
+    - constant.number: "\\b([0-9]+|0x[0-9a-fA-F]*)\\b|'.'"
+    - constant.number: "\\\\([0-7]{3}|x[A-Fa-f0-9]{2}|u[A-Fa-f0-9]{4}|U[A-Fa-f0-9]{8})"
+
+    - constant.string:
+        start: "\""
+        end: "\""
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - constant.string:
+        start: "'"
+        end: "'"
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - constant.string:
+        start: "`"
+        end: "`"
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - comment:
+        start: "#"
+        end: "$"
+        rules:
+            - todo: "(TODO|XXX|FIXME):?"