Custom syntax highlighting

For c and quickfix
Function to format the quickfix and location jump lists
Fixed issue with "help" window layouts accessing incorrect variable

config/nvim/after/syntax/c.vim

@@ -0,0 +1,32 @@
+syn clear cTodo
+syn clear cType
+
+" Custom keywords
+"
+syn keyword cStorageClass function export internal global_var thread_var local_persist
+syn keyword cOperator     cast
+
+" Type highlighting
+"
+" There are inconsistencies around this due to the horrific declaration syntax of C/C++ and
+" trying to capture that inside a regexp statement is near impossible. These are made to mostly
+" match the way I format my code.
+"
+syn match cType "\I\i*\ze\s\+\**\I\i*\s*[=;,\)\[]" " Regular declarations
+syn match cType "\I\i*\ze\s\+\**\I\i*("            " Function return types
+
+" Todo notes
+"
+syn match cTodo "@\I\i*\((\I\i*)\)\=:\?" contained
+syn match cNote "\s:\I\i*"               contained
+
+" Functions
+"
+syn match cFunction "\I\i*\ze("
+
+" Contain clusters
+"
+syn cluster cCommentGroup add=cNote
+syn cluster cPreProcGroup add=cFunc,cType
+
+hi def link cFunction Function