Add new config options for extra parameters

Add `fsiExtraInteractiveParameters` and `fsiExtraSharedParameters`,
which should both be used in favor of the old `fsiExtraParameters`.

Some fsi parameters are exclusive to the interpreter and have no
compiler equivalent. FSAC will now pass the shared parameters to the
compiler and not the interactive parameters.

Ionide-vim will append all parameters from both options to the execution
of the interpreter (usually `dotnet fsi`).

`fsiExtraParameters` will be deprecated and removed from FSAC, so it is
best to migrate away from that.

See ionide/FsAutoComplete#1210 for more
detail.

autoload/fsharp.vim

@@ -193,6 +193,8 @@ let s:config_keys_camel =
     \     {'key': 'UseSdkScripts', 'default': 1},
     \     {'key': 'dotNetRoot'},
     \     {'key': 'fsiExtraParameters', 'default': []},
+    \     {'key': 'fsiExtraInteractiveParameters', 'default': ['--readline-']},
+    \     {'key': 'fsiExtraSharedParameters', 'default': []},
     \     {'key': 'fsiCompilerToolLocations', 'default': []},
     \     {'key': 'TooltipMode', 'default': 'full'},
     \     {'key': 'GenerateBinlog', 'default': 0},
@@ -557,6 +559,12 @@ function! s:get_fsi_command()
     for prm in g:fsharp#fsi_extra_parameters
         let cmd = cmd . " " . prm
     endfor
+    for prm in g:fsharp#fsi_extra_interactive_parameters
+        let cmd = cmd . " " . prm
+    endfor
+    for prm in g:fsharp#fsi_extra_shared_parameters
+        let cmd = cmd . " " . prm
+    endfor
     return cmd
 endfunction