Backport new version to p8 branch.

New version (60.8.0).
Fixed:
2019-9811 Sandbox escape via installation of malicious language pack
2019-11711 Script injection within domain through inner window reuse
2019-11712 Cross-origin POST requests can be made with NPAPI plugins by following 308 redirects
2019-11713 Use-after-free with HTTP/2 cached stream
2019-11729 Empty or malformed p256-ECDH public keys may trigger a segmentation fault
2019-11715 HTML parsing error can contribute to content XSS
2019-11717 Caret character improperly escaped in origins
2019-11719 Out-of-bounds read when importing curve25519 private key
2019-11730 Same-origin policy treats all files in a directory as having the same-origin
2019-11709 Memory safety bugs fixed in Firefox 68, Firefox ESR 60.8, and Thunderbird 60.8
Enigmail 2.0.12.

Added ppc64le support.

Backport new version to p8 branch.

New version (60.7.2).
Fixed:
2019-11707 Type confusion in Array.pop
2019-11708 sandbox escape using Prompt:Open

Backport new version to p8 branch.

enigmail: disable pEpAutoDownload.

New version (60.7.1).
Fixed:
2019-11703 Heap buffer overflow in icalparser.c
2019-11704 Heap buffer overflow in icalvalue.c
2019-11705 Stack buffer overflow in icalrecur.c
2019-11706 Type confusion in icalproperty.c
Enigmail 2.0.11.
thunderbird-enigmail now requires pinentry-x11 (ALT #18790).
Use juniorModeForceOff by default in Enigmail (ALT #36447).
Fix l10n dtd of Enigmail.

Backport new version to p8 branch.

New version (60.7.0).
Fixed:
2019-9815 Disable hyperthreading on content JavaScript threads on macOS
2019-9816 Type confusion with object groups and UnboxedObjects
2019-9817 Stealing of cross-domain images using canvas
2019-9818 Use-after-free in crash generation server
2019-9819 Compartment mismatch with fetch API
2019-9820 Use-after-free of ChromeEventHandler by DocShell
2019-11691 Use-after-free in XMLHttpRequest
2019-11692 Use-after-free removing listeners in the event listener manager
2019-11693 Buffer overflow in WebGL bufferdata on Linux
2019-7317 Use-after-free in png_image_free of libpng library
2019-9797 Cross-origin theft of images with createImageBitmap
2018-18511 Cross-origin theft of images with ImageBitmapRenderingContext
2019-11694 Uninitialized memory memory leakage in Windows sandbox
2019-11698 Theft of user history data through drag and drop of hyperlinks to and from bookmarks
2019-5798 Out-of-bounds read in Skia
2019-9800 Memory safety bugs fixed in Firefox 67, Firefox ESR 60.7, and Thunderbird 60.7

Backport new version to p8 branch.

Fix global search indexing by link with bundled sqlite3 (ALT #35761).

New version (60.6.1).
Fixes:
2019-9810 IonMonkey MArraySlice has incorrect alias information
2019-9813 Ionmonkey type confusion with __proto__ mutations

New version (60.6.0).
Fixes:
2019-9790 Use-after-free when removing in-use DOM elements
2019-9791 Type inference is incorrect for constructors entered through on-stack replacement with IonMonkey
2019-9792 IonMonkey leaks JS_OPTIMIZED_OUT magic value to script
2019-9793 Improper bounds checks when Spectre mitigations are disabled
2019-9794 Command line arguments not discarded during execution
2019-9795 Type-confusion in IonMonkey JIT compiler
2019-9796 Use-after-free with SMIL animation controller
2019-9801 Windows programs that are not 'URL Handlers' are exposed to web content
2018-18506 Proxy Auto-Configuration file can define localhost access to be proxied
2019-9788 Memory safety bugs fixed in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6
Build with Clang.

New version (60.5.2).

Backport new version to p8 branch.