igcp: IGC flight data parser

Work in progress.

Goals are: parsing an IGC file containing flight data, giving analytics
about the flight, and if I really have time to kill, making some kind of
(3D??) view of the flight..

TODO: - convert sexagesimal (deg/min/sec) coordinates to decimal
degrees - convert decimal degrees to cartesian (x, y, z) coordinates -
choose scale to represent X meters as Y world units - get those new
units (cartesian & world units) as data fields in the doubly linked list
(so we can print GPS coords & draw 3d points using the same data
structure) - draw points in the 3d world - draw lines between these
points - make camera controls: N for Next, P for Previous - Text
information: average horizontal/vertical speed etc. - Plane mesh -
Ground texture

Dependencies

These are mainly for building the project, and for Raylib (the 3D
graphic library):

    sudo apt install libasound2-dev libx11-dev libxrandr-dev libxi-dev libgl1-mesa-dev libglu1-mesa-dev libxcursor-dev libxinerama-dev libwayland-dev libxkbcommon-dev
    sudo apt install build-essential git

You will have to compile Raylib, and then copy the archive file into
igcp’s lib directory:

    git clone --depth 1 https://github.com/raysan5/raylib.git raylib
    cd raylib/src/
    make PLATFORM=PLATFORM_DESKTOP

    cp libraylib.a PATH/TO/igcp/lib/

Compilation & Usage

Now you can compile igcp and use it:

    make
    ./a.out <file>