Enhance COBOL language support - function list & auto-completion

COBOL support in function list - new entries in functionList.xml (note: defaults to fixed-form reference format, manual switch to free-form reference-format possible in association for langID 50)

COBOL support in auto-completion - new file APIs/cobol.xml
COBOL syntax highlighter - recreated list

note: list of statements, functions and reserved words token from GnuCOBOL 3.0 (COBOL85,2002,2014 + extensions from IBM/MF/RM/ACUCOBOL), please report back if any words are missing

Close #4004

PowerEditor/src/functionList.xml

@@ -86,9 +86,13 @@
 			<association id=        "ruby_syntax"     langID="36"                          />
 			<association id=     "autoit3_function"   langID="40"                          />
 			<association id=   "innosetup_syntax"     langID="46"                          />
+			<!--
+			   As there is currently only one langID for COBOL: change to cobol_section_free
+			   if this is your favourite format
+			-->
+			<association id=  "cobol_section_fixed"   langID="50"                          />
 			<association id=  "powershell_function"   langID="53"                          />
 			<association id=  "javascript_function"   langID="58"                          />
-			<!-- ======================================================================== -->
 			<association id=       "baanc_section"    langID="60"                          />
 			<!-- ======================================================================== -->
 			<association id=         "krl_function"   userDefinedLangName="KRL"            />
@@ -1382,6 +1386,55 @@
 				</function>
 			</parser>
 
+			<!-- Variant for COBOL fixed-form reference format -->
+			<parser id="cobol_section_fixed" displayName="COBOL fixed-form reference format">
+				<function
+					mainExpr="(?x)                                             # Utilize inline comments (see `RegEx - Pattern Modifiers`)
+						(?m-s)(^.{6}[ D])                                      # ignore first 6 columns, 7 must be empty or D (debug-line)
+						([\t ]{0,3})                                           # don't start after column 12
+						(?!exit\s)[\w_-]+(\.|((?'seps'([\t ]|\*&gt;.*|([\n\r]+(.{6}([ D]|\*.*)|.{0,6}$)))+)section(\.|((?&amp;seps)(\.|[\w_-]+\.)))))
+						                                                        # all names that come before `section` but not `exit section`
+						"
+				>
+					<functionName>
+						<nameExpr expr="[\w_-]+((?=\.)|((?'seps'([\t ]|\*&gt;.*|([\n\r]+(.{6}([ D]|\*.*)|.{0,6}$)))+)section((?=\.)|(?&amp;seps)((?=\.)|[\w_-]+(?=\.)))))"/>
+					</functionName>
+				</function>
+			</parser>
+
+			<!-- Variant for COBOL free-form reference format -->
+			<parser id="cobol_section_free" displayName="COBOL free-form reference format">
+				<!-- working comment Expression:
+						 commentExpr="(?m-s)(?:\*&gt;).*$"
+					 cannot be used because problems with comment boundaries
+					 in current FunctionList implementation, for details see
+					 https://sourceforge.net/p/notepad-plus/patches/597/
+				-->
+				<!-- Variant with paragraphs (don't work with comment lines
+					 before section/paragraph header, can be activated when
+					 comment boundaries work and the commentExpr is used) -->
+				<!--
+				<function
+					mainExpr="(?m-s)(?<=\.)\s*(?!exit\s)[\w_-]+(\s+section(\s*|(\s+[\w_-]+)?))(?=\.)"
+						"
+				>
+					<functionName>
+						<nameExpr expr="(?m-s)(?<=[\s\.])[\w_-]+(\s*section\s*([\w_-]+)?)?"/>
+					</functionName>
+				</function>
+				-->
+				<!-- Variant without paragraphs (works with comment lines before section header) -->
+				<function
+					mainExpr="(?x)                                                  # Utilize inline comments (see `RegEx - Pattern Modifiers`)
+						[\s\.](?!exit\s)[\w_-]+\s+section(\s*|(\s+[\w_-]+)?)(?=\.)  # all names that come before `section` but not `exit section`
+						"
+				>
+					<functionName>
+						<nameExpr expr="[\w_-]+\s*section"/>
+				   </functionName>
+				</function>
+			</parser>
+
 			<!-- ================================================================= -->
 		</parsers>
 	</functionList>