qwt: update to 6.1.1
qwt: more files from updating to qwt 6.1.1
qwt: remove outdated constants

This is a pending change from qwt-6.1.2, and is needed to
support Qt 5.4
qwt: update qwt qmake files to build and link properly

fixes the target name, drops some unnecessary constants, etc.
scopes: adapt to renamed qwt 6.1 'set*Pen' methods
scopes: updates for qwt 6.1.1

There should be no change in functionality. How we interact
between the legend and plots had to change.
Release: tag windows portable and installers separately
Autotune: fix typo in UI
Bootloader: allow altering the startup delay

For boards without a vsense pin, it is necessary to have
sufficient delay to allow enumaration (500 ms). For boards
with a VSENSE pin this can be overridden to a shorter
period.
Sparky: use 2 ms bootloader delay

This allows Spektrum binding. Also, it bumps the bootloader
revision to 0x83.
Quanton: use 2 ms bootloader delay
Colibri: use 2 ms bootloader delay
RevoMini: use 2 ms bootloader delay
Merge pull request #1378 from peabody124/small_fixes

Small fixes
Merge pull request #1374 from peabody124/qwt_6.1.1

Upgrade to Qwt 6.1.1
Merge pull request #1385 from peabody124/spektrum_binding

Spektrum binding
GCS/smartSaveButton Added isMandatory QMap flags and access functions

isMandatory will be used to flag if an error will be shown if an object
is tried to be saved or uploaded and it doesn't exist on the hardware.
In that case a warning sign will be shown on the button which started
the operation.
GCS/ConfigTaskWidget Added setNotMandatory function
GCS/smartSaveButton processOperation handle isMandatory flag

set button tooltip with operation result information listing object that
failed to be saved/uploaded/missing_in_hw
GCS/configmodulewidget set module dependent objects to not mandatory