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Update from esp-idf v3.3 -> v3.3.4

See merge request !14

Released 2020/09/24.

A few symbols in the sdkconfig have changed, but the original SPI
patches still apply cleanly. The new symbols were left at their default
values.

Fix GCC warnings

See merge request !13

Some were found with the addition of -Wshadow.

Mostly just casting (e.g. dropping volatile), but also some unused
variables were commented out, and an out of bounds array access was
fixed in Ui_SoftBar_Setup().

Pragmas were added to silence strict-aliasing warnings, and the affected
macros were reformatted for better readability.

With the addition of these changes, no warnings are seen during the
firmware build.

Don't truncate app_elf_sha256 when parsing esp_app_desc_t

See merge request !12

This isn't currently used except to output debug-esque information about
the parsed header.

Add megapacker.pl script to create .mgu updater files

See merge request !11

This is a relatively simple Perl script that takes app and/or updater
ESP32 .bin image(s) and packs them into the .mgu format that is expected
by the MegaGRRL firmware when initiating firmware updates from the File
Browser.

Example usage, for an app-only update on the (d)esktop version:

	perl utils/megapacker.pl --app=firmware/build/megagrrl.bin --hw=d --outfile=megagrrl.mgu

To update both the app and updater images for the (p)ortable version:

	perl utils/megapacker.pl --app=megagrrl_app.bin --updater=megagrrl_updater.bin --hw=p --outfile=megagrrl_portable.mgu

To specify the version rather than extract it from the header in the
.bin file (note: the script defaults to hw version 'd'):

	perl utils/megapacker.pl --app=megagrrl.bin --version=v0.97dev --outfile=megagrrl_v0.97dev.mgu

No additional dependencies should be required if using any non-ancient
Perl.