Contribute/BiteSizedTasks

API conversion

Look for uses of malloc, and convert them to either g_malloc, g_new (more rarely g_try_malloc or g_try_new if a lot of memory is being allocated). Likewise, convert calloc to either g_new0 or g_try_new0. Drop return value checks unless using g_try_new/g_try_new0.
Add checks for NULL return value to uses of load_image_targphys, qemu_find_file.
Add checks for negative return value to uses of get_image_size.
Associate external libraries with the object files that actually use them

hw/display contains files named *_template.h. These are included many times with different values of the DEPTH macro. However, only the DEPTH == 32 case is used. Remove support for DEPTH != 32 in the template headers and in the file that include them.

tests/qemu-iotests/*.out can have trailing spaces; make checkpatch.pl not complain about that