add snippets, update syntax def

Author: guillermooo

Snippets/(catch) catch {...}.sublime-snippet

@@ -0,0 +1,7 @@
+<snippet>
+    <content><![CDATA[catch ${1:[Exception]}{
+	$2
+}$0]]></content>
+    <tabTrigger>catch</tabTrigger>
+    <scope>source.powershell</scope>
+</snippet>

Snippets/(fin) finally {...}.sublime-snippet

@@ -0,0 +1,7 @@
+<snippet>
+    <content><![CDATA[finally {
+	$1
+}$0]]></content>
+    <tabTrigger>fin</tabTrigger>
+    <scope>source.powershell</scope>
+</snippet>

Snippets/(try) try {...}.sublime-snippet

@@ -0,0 +1,7 @@
+<snippet>
+    <content><![CDATA[try {
+	$1
+}$0]]></content>
+    <tabTrigger>try</tabTrigger>
+    <scope>source.powershell</scope>
+</snippet>

Support/PowershellSyntax.JSON-tmLanguage

@@ -133,7 +133,7 @@
 			"name": "support.function.powershell"
 		},
 		{
-			"match": "\\b(?i:if|else|elseif|switch|while|default|for|do|until|break|continue|foreach|return|filter|in|trap|throw|param|begin|process|end|function|global|local|private|script|contained)\\b",
+			"match": "\\b(?i:if|else|elseif|switch|while|default|try|finally|catch|for|do|until|break|continue|foreach|return|filter|in|trap|throw|param|begin|process|end|function|global|local|private|script|contained)\\b",
 			"name": "keyword.control.powershell"
 		},
 		{

Support/PowershellSyntax.tmLanguage

@@ -211,7 +211,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>\b(?i:if|else|elseif|switch|while|default|for|do|until|break|continue|foreach|return|filter|in|trap|throw|param|begin|process|end|function|global|local|private|script|contained)\b</string>
+			<string>\b(?i:if|else|elseif|switch|while|default|try|finally|catch|for|do|until|break|continue|foreach|return|filter|in|trap|throw|param|begin|process|end|function|global|local|private|script|contained)\b</string>
 			<key>name</key>
 			<string>keyword.control.powershell</string>
 		</dict>