Settings: Master switch for Floating mode [2/2]

Add an option to launch notifications from HOVER and Heads up in Floating mode

This commit reverts "Settings: Launch HOVER notification in fullscreen [2/2]"

Change-Id: Icef3d9ce13820c7870a7c9ee4e96c19f900161fb
Settings: Add summary to notification filtering

Change-Id: I2d15d9327d6475534b1830ed61ff88e79f66638b
Proximity Wake-Up : adjust strings

Change-Id: I8741fc08419e1778c4aecf04a3b38b38a7b609ea
Settings: Fix some PT-BR strings

Change-Id: I67cc75b6b54abd4a0c7780034894150e7d1d8d43
Improve notification spam filter code.
- Follow coding style guidelines
- Replace dialog shown on click by adding the relevant information and
  the delete button to the item itself
- Minor layout tweaks
- Make the empty view more descriptive
- Add license headers

Original commit: https://github.com/CyanogenMod/android_packages_apps_Settings/commit/827e381c26118dbcd967072f66b6756abfac5ba6

Change-Id: I718561a117f790c0c95b760e83c1a1d2dd1a69e3