Fixes some embedded shell annoyances

Incorporates a lot of robballou#16

Co-Authored-By: @keith-hall

Author: michaelblyons

Embeddings/Shell (for SSH Config KnownHostsCommand).sublime-syntax

@@ -7,4 +7,4 @@ hidden: true
 extends: Shell (for SSH Config).sublime-syntax
 
 variables:
-  tokens: (?:%[%CdfHhIiKkLlnprtu])
+  ssh_config_character_escapes: (?:%[%CdfHhIiKkLlnprtu])

Embeddings/Shell (for SSH Config LocalCommand).sublime-syntax

@@ -7,4 +7,4 @@ hidden: true
 extends: Shell (for SSH Config).sublime-syntax
 
 variables:
-  tokens: (?:%[%CdhikLlnpruT])
+  ssh_config_character_escapes: (?:%[%CdhikLlnpruT])

Embeddings/Shell (for SSH Config ProxyCommand).sublime-syntax

@@ -7,4 +7,4 @@ hidden: true
 extends: Shell (for SSH Config).sublime-syntax
 
 variables:
-  tokens: (?:%[%hnpr])
+  ssh_config_character_escapes: (?:%[%hnpr])

Embeddings/Shell (for SSH Config).sublime-syntax

@@ -6,21 +6,24 @@ hidden: true
 
 extends: Packages/ShellScript/Shell-Unix-Generic.sublime-syntax
 
-variables:
-  tokens: (?:%[%CdhikLlnpru])
-
 contexts:
 
-  prototype:
+  expansions-parameter:
     - meta_prepend: true
-    - match: '%%'
-      scope: constant.character.escape.ssh
-    - match: '{{tokens}}'
-      scope: constant.other.placeholder.ssh
+    - include: ssh-config-char-escapes
 
-  string-path-pattern-body:
+  string-prototype:
     - meta_prepend: true
+    - include: ssh-config-char-escapes
+
+  ssh-config-char-escapes:
     - match: '%%'
       scope: constant.character.escape.ssh
-    - match: '{{tokens}}'
+    - match: '{{ssh_config_character_escapes}}'
       scope: constant.other.placeholder.ssh
+
+variables:
+  # lazy escaping from heredoc as shell maybe indented
+  no_indent: ^\s*
+  tab_indent: ^\s*
+  ssh_config_character_escapes: (?:%[%CdhikLlnpru])

Embeddings/Shell (for SSHD Config AuthorizedKeysCommand).sublime-syntax

@@ -7,4 +7,4 @@ hidden: true
 extends: Shell (for SSH Config).sublime-syntax
 
 variables:
-  tokens: (?:%[%CDfhkstUu])
+  ssh_config_character_escapes: (?:%[%CDfhkstUu])

Embeddings/Shell (for SSHD Config AuthorizedPrincipalsCommand).sublime-syntax

@@ -7,4 +7,4 @@ hidden: true
 extends: Shell (for SSH Config).sublime-syntax
 
 variables:
-  tokens: (?:%[%CDFfhiKksTtUu])
+  ssh_config_character_escapes: (?:%[%CDFfhiKksTtUu])

Tests/syntax_test_client.ssh_config

@@ -42,10 +42,10 @@ Match Host targ?t_host Exec not_inside_network User sue
 #                   ^^^^^^^^^^^^^^^^^^^^^^ meta.function-call.arguments.shell
 #                    ^^ meta.parameter.option.shell variable.parameter.option.shell
 #                    ^ punctuation.definition.parameter.shell
-#                         ^^^ meta.string.shell string.unquoted.shell
+#                       ^^^^^ meta.string string.unquoted.shell
 #                       ^^ constant.other.placeholder.ssh
 #                          ^^ constant.other.placeholder.ssh
-#                             ^^^^^^^^^^^^ meta.string.shell string.unquoted.shell
+#                             ^^^^^^^^^^^^ meta.string string.unquoted.shell
 #                @@@ reference
 ##                       ^^ meta.string.shell string.unquoted.shell
 
@@ -129,7 +129,7 @@ Host server serverino !other-pat?ern
 #                  ^^^^^^^^^^^^^^^^^^^^^^^^ meta.function-call.arguments.shell
 #                   ^^ meta.parameter.option.shell variable.parameter.option.shell
 #                   ^ punctuation.definition.parameter.shell
-#                      ^^^^^^^^^^^^^^ meta.string.shell string.unquoted.shell
+#                      ^^^^^^^^^^^^^^ meta.string string.unquoted.shell
 #                                     ^^ constant.other.placeholder.ssh
 #                                        ^^ constant.other.placeholder.ssh
 #                                          ^                            - source.shell