Further source code rearrangement

Moved all files but `LEDControl.c` and `LEDControl.h` to
`src/kaleidoscope/plugin/LEDControl`, to not pollute the `kaleidoscope/plugin`
directory needlessly, with headers that should not be explicitly included.

Also updated the documentation and the warnings emitted to make it clear that
the use of `LED-Off.h` and `LEDUtils.h` is deprecated in favour of just using
`<Kaleidoscope-LEDControl.h>`.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

doc/plugin/LEDControl.md

@@ -7,13 +7,11 @@ effects.
 
 ## Upgrading
 
-The `LEDUtils.h` and `LED-Off.h` headers were moved, and need a
-`kaleidoscope/plugin/` prefix now. The old headers still work, but are
-deprecated, and will emit a warning. Both of them are included by
-`<Kaleidoscope-LEDControl.h>` by default, so instead of migrating to the new
-paths, one might wish to simply drop them instead.
+The `LEDUtils.h` and `LED-Off.h` headers are now included by default when using
+`<Kaleidoscope-LEDControl.h>`, and their explicit use is therefore deprecated.
+The includes can be safely removed.
 
-The compatibility headers will be removed by 2019-01-14.
+Compatibility headers are in place for both, but will be removed by 2019-01-14.
 
 Furthermore, to implement LED modes, one should use
 `kaleidoscope::plugin::LEDMode` as a base class now, instead of the former

src/Kaleidoscope-LEDControl.h

@@ -17,5 +17,5 @@
 #pragma once
 
 #include <kaleidoscope/plugin/LEDControl.h>
-#include <kaleidoscope/plugin/LEDUtils.h>
-#include <kaleidoscope/plugin/LED-Off.h>
+#include <kaleidoscope/plugin/LEDControl/LEDUtils.h>
+#include <kaleidoscope/plugin/LEDControl/LED-Off.h>

src/LED-Off.h

@@ -16,6 +16,6 @@
 
 #pragma once
 
-#warning Please migrate to including "kaleidoscope/plugin/LED-Off.h" instead of "LED-Off.h", or even consider dropping the include, because <Kaleidoscope-LEDControl.h> will pull the right header in anyway.
+#warning The "LED-Off.h" header is deprecated, the mode is included by default when using <Kaleidoscope-LEDControl.h>. It can be safely removed.
 
-#include "kaleidoscope/plugin/LED-Off.h"
+#include "kaleidoscope/plugin/LEDControl/LED-Off.h"

src/LEDUtils.h

@@ -16,6 +16,6 @@
 
 #pragma once
 
-#warning Please migrate to including "kaleidoscope/plugin/LEDUtils.h" instead of "LEDUtils.h", or even consider dropping the include, because <Kaleidoscope-LEDControl.h> will pull the right header in anyway.
+#warning The "LEDUtils.h" header is deprecated, the mode is included by default when using <Kaleidoscope-LEDControl.h>. It can be safely removed.
 
-#include "kaleidoscope/plugin/LEDUtils.h"
+#include "kaleidoscope/plugin/LEDControl/LEDUtils.h"

src/kaleidoscope/plugin/LEDControl/BootAnimation.cpp

@@ -14,7 +14,7 @@
  * this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "kaleidoscope/plugin/BootAnimation.h"
+#include "kaleidoscope/plugin/LEDControl/BootAnimation.h"
 #include "Kaleidoscope-LEDControl.h"
 
 #ifdef ARDUINO_AVR_MODEL01

src/kaleidoscope/plugin/LEDControl/LED-Off.cpp

@@ -14,7 +14,7 @@
  * this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "kaleidoscope/plugin/LED-Off.h"
+#include "kaleidoscope/plugin/LEDControl/LED-Off.h"
 
 namespace kaleidoscope {
 namespace plugin {

src/kaleidoscope/plugin/LEDControl/LEDUtils.cpp

@@ -14,7 +14,7 @@
  * this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "kaleidoscope/plugin/LEDUtils.h"
+#include "kaleidoscope/plugin/LEDControl/LEDUtils.h"
 
 cRGB
 breath_compute(uint8_t hue, uint8_t saturation) {