[Qt] add messages when handling local payment request files

- important for the open URI dialog to give users feedback
  when a file is invalid etc.
Don't create empty transactions when reading corrupted wallet

The current transaction loading code is not exception safe.
An exception during deserialization causes an empty transaction
to be left behind in the wallet.

Fix this by building the transaction separately and adding
it only to the wallet at the end.

Fixes #3333.
better std::exception logging for block/undo files
[Qt] don't regenerate autostart link on every client startup

- allows users to add additional paramaters via the autostart link
- related to #2197
Store orphan blocks in serialized form
src/leveldb/Makefile is ignored?

remove the "-" in leveldb-* to include src/leveldb/Makefile
qt: use series of pngs for spinner

Use a series of .png frames for the spinner instead of a .mng.
`mng` is an obscure image format and is not built by default into Qt5.

This appears to improve the crispness of the spinner as well.

Does not noticably increase the size (still ~27k) and the code
is not more complicated either.
qt: Minor message updates

Used sending/receiving addresses -> Sending/receiving addresses
Previously requested payments -> Requested payments (idea from @cozz in #3521)
Merge pull request #3374

bd70562 [Qt] add messages when handling local payment request files (Philip Kaufmann)
Merge pull request #3528

66a8829 qt: Minor message updates (Wladimir J. van der Laan)
qt: English translation update
Merge pull request #3532

f087ce8 qt: English translation update (Wladimir J. van der Laan)
Merge pull request #3516 from sipa/serorphans-head

Store orphan blocks in serialized form
Merge pull request #3525

15570cc src/leveldb/Makefile is ignored? (harry)
Merge pull request #3526

f10b2d7 qt: use series of pngs for spinner (Wladimir J. van der Laan)
qt: Update copyright year in about dialog to 2014
build: Update the other win32 deps

- miniupnpc-1.8
- openssl-1.0.1e
- zlib-1.2.8
- libpng-1.6.8
- qrencode-3.4.3
build: upgrade Qt used by windows build to 5.2.0
qt: Update remaining "The Bitcoin Core Developers"
build: use Ubuntu 12.04 for linux gitian build