Add ALERename (tsserver & LSP), ALEOrganizeImports (tsserver) and auto import support (tsserver) (#2709)

This commit adds support for renaming symbols in tsserver and with LSP tools, and for organising imports with tsserver. Completion results for symbols that can be imported are now suggested if enabled for tsserver completion done via ALE.

doc/ale.txt

@@ -376,6 +376,10 @@ The |ALEComplete| command can be used to show completion suggestions manually,
 even when |g:ale_completion_enabled| is set to `0`. For manually requesting
 completion information with Deoplete, consult Deoplete's documentation.
 
+When working with TypeScript files, ALE by can support automatic imports
+from external modules. This behavior can be enabled by setting the
+|g:ale_completion_tsserver_autoimport| variable to `1`.
+
                                                *ale-completion-completeopt-bug*
 
 ALE Automatic completion implementation replaces |completeopt| before opening
@@ -597,6 +601,16 @@ b:ale_completion_enabled                             *b:ale_completion_enabled*
   See |ale-completion|
 
 
+g:ale_completion_tsserver_autoimport      *g:ale_completion_tsserver_autoimport*
+
+  Type: Number
+  Default: `0`
+
+  When this option is set to `0`, ALE will not try to automatically import
+  completion results from external modules. It can be enabled by setting it
+  to `1`.
+
+
 g:ale_completion_excluded_words               *g:ale_completion_excluded_words*
                                               *b:ale_completion_excluded_words*
   Type: |List|
@@ -1317,6 +1331,27 @@ g:ale_pattern_options_enabled                   *g:ale_pattern_options_enabled*
   will not set buffer variables per |g:ale_pattern_options|.
 
 
+g:ale_rename_tsserver_find_in_comments  *g:ale_rename_tsserver_find_in_comments*
+
+  Type: |Number|
+  Default: `0`
+
+  If enabled, this option will tell tsserver to find and replace text in
+  comments when calling |ALERename|. It can be enabled by settings the value
+  to `1`.
+
+
+g:ale_rename_tsserver_find_in_strings   *g:ale_rename_tsserver_find_in_strings*
+
+
+  Type: |Number|
+  Default: `0`
+
+  If enabled, this option will tell tsserver to find and replace text in
+  strings when calling |ALERename|. It can be enabled by settings the value to
+  `1`.
+
+
 g:ale_set_balloons                                         *g:ale_set_balloons*
                                                            *b:ale_set_balloons*
 
@@ -2543,6 +2578,18 @@ ALEHover                                                             *ALEHover*
   A plug mapping `<Plug>(ale_hover)` is defined for this command.
 
 
+ALEOrganizeImports                                         *ALEOrganizeImports*
+
+  Organize imports using tsserver. Currently not implemented for LSPs.
+
+
+ALERename                                                           *ALERename*
+
+  Rename a symbol using TypeScript server or Language Server.
+
+  The user will be prompted for a new name.
+
+
 ALESymbolSearch `<query>`                                     *ALESymbolSearch*
 
   Search for symbols in the workspace, taken from any available LSP linters.