Jamstats

* Adds a GUI interface for setting parameters (invoke it by running the command with no arguments, or double-clicking the executable)
* Fixes a large number of bugs related to the jamstats webserver: makes optional arguments like `theme` work, e.g.
* Adds some functionality to the jamstats webserver:
* You can now choose the IP you want to run on
* Allows connection from other machines on the network (that wasn't working before)
* DIsplays the IP and port of the jamstats server in the UI
* Now builds plots for the "Current" game when connecting to a scoreboard

Mac executable! This release includes a Mac executable file, `jamstats-mac-v0.3.4`, that you can download and use from the commandline. No drag-and-drop support yet.

Other changes:
* changed Windows executable name from `jamstats.exe` to `jamstats-v0.3.4-alpha.exe` to make it easier to track which version you're using
* restored jamstats logo in PDFs and webserver
* restored jamstats version info on commandline, in PDFS and webserver

* Bugfixes: problems with 0.3.2 broke the Windows executable
* Added a (pretty experimental) webserver option:
* instead of specifying an output file, you can specify a port number. jamstats will start a webserver on that port where you can view plots, including plots from an in-progress game.

- Added jamstats logo to the tables
- Added jamstats version string to lower left corner of plots.
- Added scoreboard version number to the first table.

Numerous visual tweaks:
* added column-dividing lines, and line indicating lead, to the jam barplot
* made penalty colors consistent across both teams' plots
* made skater color palette consistent
* new jamstats logo for icon
* added penalties per jam to the skater plot

Also changed the way injuries are reported in the first table. Value given is the number of jams that ended in injury.

* Combined the former `jamstats-plot-pdf` and `jamstats-convert-tsv` into a single command, `jamstats` (`jamstats.exe` on Windows)
* to write a .tsv instead of building plots, specify an output file with extension `.txt` or .`tsv`
* Numerous cosmetic changes
* Prettier logo