Rename file layer_switch to action_layer

Refine ACT_LAYER and ACT_LAYER_TAP

- Remove ACT_LAYER_BITOP

Remove ACT_KEYMAP and ACT_OVERLAY

- Remove ACT_OVERLAY
- Rename ACT_KEYMAP to ACT_LAYER
- Add ACT_LAYER_BITOP

Fix BOOTLOADER_SIZE setting

Refine README.md

Merge branch 'action_tapping'

Add action_tapping.[ch] for refactoring

Merge branch 'matrix_scan_fix'

Fix debouncing on gh60, hbkb, macway

Merge branch 'suspend_fix'

Add sleep LED test command

Fix Makefile of gh60

Add supsend and wakeup to pjrc stack

Add common/suspend.c

Merge branch 'yeeeargh-patch'

Fix hid_liber for new keymap framework by yeeeargh

Merge branch 'add_build_options'

Changed Makefile and config.h for new options

Clean action.c

Add NO_ACTION_ONESHOT config option