Merge pull request #18698 from nullaus/bug999511

bug 999511
Bug 995350 - [SMS] - Display Save button for attached image file name having hidden directories ".gallery/". r=julien
Bug 1002501 - Regression: Incorrect background colour of disabled back/forward buttons
Bug 982240 - [Calendar] Day view: disabling calendar hides hours that contained events
Merge pull request #18616 from evanxd/bug-951084

Bug 951084 - [Calendar] Today button design
Merge pull request #18614 from 6a68/bug-988080-update-fxa-fte-post-signup-copy

Bug 988080 - Update copy for FxA FTE post-signup screen
Bug 994911 - FxA COPPA message shows raw HTML r=ferjm
Merge pull request #18460 from 6a68/bug-994911-coppa-error-raw-html

Bug 994911 - FxA COPPA message shows raw HTML
Bug 965486 - [Camera] Build time configuration system
Merge pull request #18731 from cctuan/999413

Bug 999413 - clean useless files when execute make
Merge pull request #18725 from dmarcos/bug965486

Bug965486
Merge pull request #18631 from tauzen/Bug999569

Bug 999569 [NFC] Initialization test cases for NfcManager r=alive
Bug 967089 - [gallery] remove visibility monitor code if it is no longer needed
Merge pull request #17837 from shamenchens/Bug967089-Remove-Visibility-Monitor-ImgSrc2

Bug 967089 - [gallery] remove visibility monitor code if it is no longer..., r=punam
Bug 796474 - [email] quasi-infinite scroll may hitch under OMTC; consider using absolute positioning with virtual coordinate space
Merge pull request #18671 from jrburke/bug796474-email-virtual-scroll-slim

Bug 796474 - [email] quasi-infinite scroll may hitch under OMTC r=asuth
Merge pull request #18655 from kamituel/Bug_997338_3

Bug 997333: Fixed comments. Added null-check in fromUTF8(). r=alive
Bug 996522 - [NFC] reset currentURL to null in Homescreen. r=alive
Merge pull request #18416 from azasypkin/bug-997053-attachment-assets

Bug 997053 - [Messages] Update @2.25x assets for attachment placeholders and move it to the correct place.
Merge pull request #18718 from azasypkin/bug-995350-save-button

Bug 995350 - [SMS] - Display Save button for attached image file name having hidden directories ".gallery/". r=julien