Move core and runtime files to a single library

Now core and runtime files are build in the same library,
libarm_compute.so and libarm_compute-static.a. Create a dummy
core library for not breaking backwards compatibility.

Update documentation on fat binaries and new high priority
library.

Fixed issue on scons when using the install_dir feature.

Change-Id: I5a8a6bbe2808243eba07fd135496995259d8702f
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5845
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/filelist.json b/filelist.json
index 1eef446..454d0fd 100644
--- a/filelist.json
+++ b/filelist.json
@@ -684,7 +684,8 @@
       "DirectConv2d",
       "Permute",
       "Pool2d",
-      "Reshape"
+      "Reshape",
+      "FillBorder"
     ],
     "operators": {
       "Activation": {