Avatar2

* Improvements:
* local argument to load_plugin
* Automated PyPi deploy for tagged commits (i.e. new versions)

* Bugfixes:
* PyPandaTarget Write Memory command
* Removed usage of "objects" in assembler plugin

* Major Updates:
* Inception debugger target and protocol for Cortex-M3
* PyPanda Target
* MIPS support
* Dropping support for Python 2.7
* Docker file/image generation for avatar2
* avatar-qemu updated to v5.1

* New Plugins:
* GDB server
* GDB memory_map_loader

* Improvements:
* The two-tiered breakpoint approach
* Add support of latest pygdbmi
* Supporting Ubuntu 20.04 as default image
* Defaulting to gdb-multiarch
* New boolean `log_to_stdout` kwarg for main avatar object

* Bugfixes:
* Removed 100% CPU resource usage on idle
* Support new version of pygdbmi (while staying backwards compatible)

* Major Updates:
* Qemu Endpoint set to version 4.2.0-rc5
* avatar-panda got mainlined into PANDA
* Improvements
* set_break_condition for gdb-protocol
* gdb protocol allows to catch syscalls
* Using more performant gdb-protocol as default for openocd-target
* Better error handling for OpenOCDTarget
* Bugfixes:
* enum3.4 dependency conditional on python version (thanks rhelmot)
* EXIT is a valid transition for wait (thanks Kyle-Kyle)
* breakpointhitmessage uses int for breakpoint number
* various fixes for CI

* Major update: Pretender release (https://www.usenix.org/conference/raid2019/presentation/gustafson)
* IRQ injection into Qemu
* IRQ forwarding from cortex-m devices (plugins/arm/armv7_interrupts)
* NVIC emulation for cortex-m3 mcus fo QemuTarget
* Coresight protocol
* armv7m_interrupt protocol
* max32_usart.py peripheral
* Features:
* Avatar object can now load or save configuration files, specifying
targets and memory ranges
* Enhancement for targets using GDBProtocol (set_file, download, get_symbol)
(thanks drizzin-novalabs)
* Improvements:
* Allow avatar-qemu to build with -Werror -Wunused-function (29)
* Pyperipheral improvements
* Sanity check of memory read/writes go to mapped memory
* CI tests for python peripherals

* Features:
* CHANGELOG for keeping track of changes
* Jlink Target (thanks subwire)
* Improvements:
* log_items and log_file kwargs for Qemu-Target
* Migration to Ubuntu 18.04 as test platform
* Ask user before writing to /etc/apt/sources/list in install scripts
* CI upgrades
* Various bugfixes