core: Add generic LE/BE load/store uint type convertors and use them in msgb

Submitted-by: Max <max.suraev@fairwaves.co>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/.gitignore b/.gitignore
index 71b27f2..c85d04d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -89,7 +89,7 @@
 
 src/crc*gen.c
 include/osmocom/core/crc*gen.h
-
+include/osmocom/core/bit*gen.h
 
 # vi files
 *.sw?