Add FPrime support

[capsulecorplab]

closes #21

Testing procedure

1. clone or download fleet-workspace-image repo (if not already cloned) into home directory

cd ~
git clone https://github.com/capsulecorplab/mdrs-workspace-image.git

2. change directory to mdrs-workspace-image repo

cd ~/mdrs-workspace-image

3. change :main to :pr-28 on image name in docker-compose.yml
4. pull docker image with docker-compose pull (this may take a few minutes)
5. spin up docker image with docker-compose up
6. log into kasm image by going to https://localhost:6901 in a web browser and enter credentials
7. Recursively clone fprime-baremetal-reference

cd ~
git clone --recursive https://github.com/fprime-community/fprime-baremetal-reference.git

8. Checkout fprime3.4.0 branch in fprime-baremetal-reference repo

cd ~/fprime-baremetal-reference
git checkout fprime3.4.0

9. Initialize submodules in fprime-baremetal-reference repo

cd ~/fprime-baremetal-reference
git submodules update --init --recursive

10. Checkout fprime3.4.0 branch in fprime-baremetal-reference/lib/arduino/fprime-arduino submodule
    cd ~/fprime-baremetal-reference/lib/arduino/fprime-arduino
    git checkout fprime3.4.0
11. Generate fprime build cache in fprime-baremetal-reference repo

cd ~/fprime-baremetal-reference
fprime-util generate

12. Run build in fprime-baremetal-reference repo

cd ~/fprime-baremetal-reference
fprime-util build -j4

[capsulecorplab]

builds fprime-baremetal-reference as of f6d74c8