Close v-win menu when selecting one of its options.
Add support for dumping symbols to storage memory in a format that Eigenmath can recognize later.
Implement session loading and restoring. Restores console scrollback and Eigenmath symbols (variables), command history is still to be done.
Right now the process is quite transparent to the user, but symbol saving could be faster.
No need to save "last" separately and no need to delete the previous file (we can just let junk be in the end of the file... but 99% of the times, the file increases in size, so there's no difference).