elm config: add key bindings for elm_actionslider

Allow changing value of actionslider with keyboard. Make actionslider
focusable widget.

@feature

Conflicts:
	config/default/base.src.in
	config/mobile/base.src.in
	config/standard/base.src.in
config: do not use elm_config from previous epoch.

Summary:
This commit fixes elm_config version mismatch occuring after b8606d93.
Config version in config source files has been set to proper values.
Patch deletes also previous code used to update config from previous epoch.

Current behavior when elm config is outdated:
1. if epoch is outdated - do not use user config - load system config instead.
   Leave it to user to recreate elm_config using elementary_config. Act like it
   was no config in user directory.
2. if generation is outdated and epoch is up-to-date - try to update user config.

Reviewers: raster, seoz, z.kosinski

Subscribers: seoz

Differential Revision: https://phab.enlightenment.org/D1223

Conflicts:
	config/default/base.src.in
	config/mobile/base.src.in
	config/standard/base.src.in
Slider: Added APIs to set/get slider's indicator visibility mode.

Summary:
elm_config_slider_indicator_visible_mode_set
elm_config_slider_indicator_visible_mode_get

The patch will enable the slider's indicator to get

visible always
visible on focus
visible never
visible on slider value change

Reviewers: raster, seoz

Subscribers: sachin.dev

Differential Revision: https://phab.enlightenment.org/D1558
elm_cnp: decode escaped ASCII-encoded URI for dnd

Summary:
encoded URI is pasted in terminology on dnd with file which has blank in name
ex. Test Blank.avi -> Test%20Blank.avi

Therefore, decode it when we extract file uris from uri list by using efreet.
by the way, copy and paste code likely needs refactoring..

Reviewers: raster, cedric

Subscribers: billiob, seoz

Differential Revision: https://phab.enlightenment.org/D1384
slider: Clean up of the previous slider patch.

- This is a first clean up of 65240b5327e5ab1eb8f77835b4729444fe1f02df
- Fix wrong version for since tag.
- Fix indentation and remove trailing whitespaces.
- Make the code more readable.
- Remove a unused variable.