Add getnetworkhashps to get the calculated network hashrate
Hardcode string in miniupnpcstring.h and remove wine requirement from deps-win32.yml

Credit: sipa, cfields, Luke-Jr and michagogo contributed to this fix.

Removing wine as a win32 build dep is beneficial to fixing Gitian LXC,
which would enable many more people to join in the gitian.sigs process
by being able to build with a linux VM instead of a virt capable host.
Merge pull request #3042 from wtogami/nowinedep

Hardcode string in miniupnpcstring.h and remove wine from deps-win32.yml
Bitcoin-Qt: translation fixes in sendcoins

- remove some unneeded translatable strings from sendcoinsentry.ui file and
  rename some elements for better readability
- optimize string prorcessing in SendCoinsDialog::on_sendButton_clicked()
- make all UI labels for secure payments plain text and move the settings
  to sendcoinsentry.ui file
- remove unneeded button and default button definiton from warning message
  boxes
- remove fixed font-size when sending coins to an address with label and
  use monospace font for addresses
Merge pull request #2888 from litecoin-project/getnetworkhashps

Add getnetworkhashps to get the estimated network hashrate
Merge pull request #2991 from Diapolo/translation_fixes

Bitcoin-Qt: translation fixes in sendcoins
Support absence of wallet (pwalletMain==NULL) in several locations,
notably RPC.
Merge branch 'pwalletmain' - checking pwalletMain for NULL,
a pre-req for no-wallet support.