Sumatra PDF 3.1.2

- Fixed issue with icons being purple in latest Windows 10 update
- Tell Windows 10 that SumatraPDF can open supported file types

- Use Windows context menu to add PDF files for splitting or merging.
- Set permissions, password, meta for output files both in "Split" and "Merge" modes.
- Select certain pages or page ranges of files to be merged in “Merge” mode.
- Easy sorting of split PDF files due to their new naming.
- Compress output PDF files.
- Version of the program is now visible on loading screen.
- Several GUI bug fixes.

- (re)add support for old processors that don’t have SSE2
- support newer versions of unrar.dll
- allow keeping browser plugin if it’s already installed
- crash fixes

# Changes:
- 64bit builds
- all documents are restored at startup if a window with multiple tabs is closed (or if closing happened through File -> Exit); this can be disabled through the RestoreSession advanced setting
- printing happens (again) always as image which leads to more reliable results at the cost of requiring more printer memory; the "Print as Image" advanced printing option has been removed
- scrolling with touchpad (e.g. on Surface Pro) now works
- many crash and other bug fixes

# Changes in this release:
* Tabs! Enabled by default. Use Settings/Options... menu to go back to the old UI
* support table of contents and links in ebook UI
* add support for PalmDoc ebooks
* add support for displaying CB7 and CBT comic books (in addition to CBZ and CBR)
* add support for LZMA and PPMd compression in CBZ comic books
* allow saving Comic Book files as PDF
* swapped keybindings:
- F11 : Fullscreen mode (still also Ctrl+Shift+L)
- F5 : Presentation mode (also Shift+F11, still also Ctrl+L)
* added a document measurement UI. Press 'm' to start. Keep pressing 'm' to change measurement units
* new advanced settings: FullPathInTitle, UseSysColors (no longer exposed through the Options dialog), UseTabs
* replaced non-free UnRAR with a free RAR extraction library. If some CBR files fail to open for you, download unrar.dll from http://www.rarlab.com/rar_add.htm and place it alongside SumatraPDF.exe
* deprecated browser plugin. We keep it if was installed in earlier version

# Changes:
- use less memory for comic book files
- PDF rendering fixes

# Changes:
* Hopefully fix frequent ebook crashes

# Changes:
* 2 page view for ebooks
* New keybindings:
- Ctrl+PgDn, Ctrl+Right : go to next page
- Ctrl+PgUp, Ctrl+Left : go to previous page
* 10x faster ebook layout
* support JP2 images
* new advanced settings: ShowMenuBar, ReloadModifiedDocuments, CustomScreenDPI
* left/right clicking no longer changes pages in fullscreen mode (use Presentation mode if you rely on this feature)
* fixed multiple crashes and made multiple minor improvements

# Changes:
* full-screen mode for ebooks (Ctrl-L)
* new key bindings:
> F9 - show/hide menu (not remembered after quitting)
> F8 - show/hide toolbar
* support WebP images (standalone and in comic books)
* support for RAR5 compressed comic books
* fixed multiple crashes

# Changes in this release:
* fix changing a language via Settings/Change Language

# Changes in this release:
- no longer using SSE2 to support old computers

# Changes:
- Greater configurability via advanced settings
- "Go To Page" in ebook ui
- add View/Manga Mode menu item for Comic Book (CBZ/CBR) files
- new key bindings:
> Ctrl-Up : page up
> Ctrl-Down : page down
- add support for OpenXPS documents
- support Deflate64 in Comic Book (CBZ/CBR) files
- fixed missing paragraph indentation in EPUB documents
- printing with "Use original page sizes" no longer centers pages on paper
- reduced size. Installer is ~1MB smaller

- fixed ebooks sometimes not remembering the viewing position
- fixed Sumatra not exiting when opening files from a network drive
- fixes for most frequent crashes and PDF parsing robustness fixes

- add support for FictionBook ebook format
- add support for PDF documents encrypted with Acrobat X
- “Print as image” compatibility option in print dialog for documents that fail to print properly
- new command-line option: -manga-mode [1|true|0|false] for proper display of manga comic books
- many robustness fixes and small improvements