Added Ziglang syntax support (#1354)

* Added Ziglang syntax support

* Removed unused constant string markup

* Added 'fn' as keyword

* Added constant matching ending with numbers and proper hexadecimal matching

* Added missing types

* Added all keywords in alphabetical order

runtime/syntax/zig.yaml

@@ -0,0 +1,37 @@
+filetype: zig
+
+detect:
+    filename: "\\.zig$"
+
+rules:
+    # function definition
+    - identifier: "fn [a-z0-9_]+"
+      # Reserved words
+    - statement: "\\b(align|and|allowzero|anyerror|asm|async|await|break|cancel|catch|comptime|const|continue|defer|else|enum|errdefer|error|export|extern|false|fn|for|if|inline|nakedcc|noalias|null|or|orelse|packed|promise|pub|resume|return|linksection|stdcallcc|struct|suspend|switch|test|threadlocal|true|try|undefined|union|unreachable|use|var|volatile|while)\\b"
+      # builtin functions
+    - special: "@+[a-z_]+"
+      # Constants
+    - constant: "[A-Z][A-Z_]+([0-9]+)?"
+      # Numbers (hexadecimal + decimal)
+    - constant.number: "\\b(0x[A-F0-9]+|[0-9]+)\\b"
+      # Primitive Types / Derived Data Types
+    - type: "([A-Z][a-z]+|(i8|u8|i16|u16|i32|u32|i64|u64|i128|u128|isize|usize|c_short|c_ushort|c_int|c_uint|c_long|c_ulong|c_longlong|c_ulonglong|c_longdouble|c_void|f16|f32|f64|f128|bool|void|noreturn|type|anyerror|comptime_int|comptime_float))"
+
+    - constant.string:
+        start: "\""
+        end: "\""
+        skip: "\\\\."
+        rules:
+            - constant.specialChar: "\\\\."
+
+    - comment:
+        start: "//"
+        end: "$"
+        rules:
+            - todo: "(TODO|XXX|FIXME):?"
+
+    - comment:
+        start: "/\\*"
+        end: "\\*/"
+        rules:
+            - todo: "(TODO|XXX|FIXME):?"