carp checkers: add carp checker and make it work

Pond.package/CarpCheckParser.class/README.md

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+I’m a parser for the results of a Carp check.

Pond.package/CarpCheckParser.class/instance/parse..st

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+parsing
+parse: aStream
+	| split contents |
+	contents := aStream upToEnd.
+	contents ifEmpty: [ ^ OrderedCollection new ].
+	split := contents splitOn: '\n'.
+	^ split collect: [ :s | self parseLine: s ]

Pond.package/CarpCheckParser.class/instance/parseLine..st

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+parsing
+parseLine: aLine
+	| split res |
+	split := aLine splitOn: ':'.
+	split size == 3 ifFalse: [ 
+		^ CarpParseError new message: 'unparseable checker line: "' , aLine , '"'].
+	res := CarpParseError new
+		  file: (split at: 1);
+		  line: (split at: 2) asNumber.
+	split := (split at: 3) splitOn: ' '.
+	^ res
+		  column: (split at: 1) asNumber;
+		  message: (' ' join: split allButFirst)

Pond.package/CarpCheckParser.class/properties.json

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+{
+	"commentStamp" : "VeitHeller 12/16/2019 11:18",
+	"super" : "Object",
+	"category" : "Pond",
+	"classinstvars" : [ ],
+	"pools" : [ ],
+	"classvars" : [ ],
+	"instvars" : [ ],
+	"name" : "CarpCheckParser",
+	"type" : "normal"
+}