[Bug] Repl Multi-Expression Prompts Are Still a Problem

[EagleoutIce]

With #657 we maintain the quotes for shell commands. While this works great for external commands (i.e. those involving another parsing round), :parse - for example - does not. This causes the following, arguably counter-intuitive behavior:

node dist/src/flowr.js 
R> :parse "x <- 2; x * 3"
exprlist
╰ expr
  ╰ STR_CONST "\"x <- 2; x * 3\"" (1:1─1:15)

Now, dropping the quotes yields this (due to the splitting at ; for shell commands):

R> :parse x <- 2; x * 3
exprlist
╰ expr
  ├ expr
  │ ╰ SYMBOL "x" (1:1)
  ├ LEFT_ASSIGN "<-" (1:3─1:4)
  ╰ expr
    ╰ NUM_CONST "2" (1:6)
R process exited with code 1. Restarting...
If you want to exit, press either Ctrl+C twice, or enter :quit
Error: object 'x' not found
Execution halted

R> 

We should 1) only drop quotes if external re-parsing is involved, or 2) find another way to "quote" these inline blocks.