[GR-4099] FastR grid support for raster images plus small fix.

.../truffle/r/library/fastrGrid/FastRGridExternalLookup.java

...rary/src/com/oracle/truffle/r/library/fastrGrid/GPar.java

...om/oracle/truffle/r/library/fastrGrid/GridColorUtils.java

...y/src/com/oracle/truffle/r/library/fastrGrid/LRaster.java

...oracle/truffle/r/library/fastrGrid/device/GridDevice.java

.../oracle/truffle/r/library/fastrGrid/device/SVGDevice.java

.../r/library/fastrGrid/device/awt/BufferedJFrameDevice.java

...ffle/r/library/fastrGrid/device/awt/Graphics2DDevice.java

mx.fastr/copyrights/overrides