Add next:into:startingAt: and readInto:startingAt:count: to readable streams

fixes #177

Author: j4yk

src/FS-AnsiStreams.package/TReadableStream.trait/instance/next.into.startingAt..st

@@ -0,0 +1,10 @@
+reading
+next: n into: aCollection startingAt: startIndex
+	"Read n objects into the given collection. 
+	Return aCollection or a partial copy if less than n elements have been read."
+	
+	| count |
+	count := self readInto: aCollection startingAt: startIndex count: n.
+	count = n
+		ifTrue:[ ^aCollection ]
+		ifFalse:[ ^aCollection copyFrom: 1 to: startIndex + count - 1 ]

src/FS-AnsiStreams.package/TReadableStream.trait/instance/readInto.startingAt.count..st

@@ -0,0 +1,9 @@
+reading
+readInto: aCollection startingAt: startIndex count: n
+	"Read n objects into the given collection. 
+	Return number of elements that have been read."
+	| obj |
+	0 to: n - 1 do: [:i |
+		obj := self next ifNil: [ ^i ].
+		aCollection at: startIndex + i put: obj].
+	^n

src/FS-AnsiStreams.package/TReadableStream.trait/methodProperties.json

@@ -4,9 +4,11 @@
 	"instance" : {
 		"collectionSpecies" : "jr 3/7/2017 16:49",
 		"do:" : "jr 6/7/2017 12:49",
+		"next:into:startingAt:" : "jr 10/13/2018 23:09",
 		"nextLine" : "jr 6/7/2017 12:55",
 		"nextMatchFor:" : "jr 6/7/2017 12:57",
 		"peekFor:" : "jr 6/7/2017 13:05",
+		"readInto:startingAt:count:" : "jr 10/13/2018 23:08",
 		"skip:" : "jr 6/7/2017 13:09",
 		"skipTo:" : "jr 6/7/2017 12:58",
 		"upTo:" : "jr 6/7/2017 13:14",