Replacement of Image(device, int, int) constructor in examples/snippets #2827
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This PR takes over a part to change all occurences of the image(device, int, int) constructor with the image(device, gc, int, int) constructor.
Within examples/snippets, almost all usages of the stated constructor are now replaced by an ImageGcDrawer and the Image(device, gc int, int) constructor afterwards. This replacement has/could not be made for the snippets {387, 215, 292, 95, 139} and partially not for 141. The details for them are commented here: vi-eclipse/Eclipse-Platform#310 (comment).