"nonstop": true option (default: false) on launch.json

attach configuration in launch.json file `"nonstop": true` option
is supported. If nonstop is true, do not pause on attach timing.

fix #739

lib/debug/server_dap.rb

@@ -273,17 +273,22 @@ def process
         when 'launch'
           send_response req
           UI_DAP.local_fs_map_set req.dig('arguments', 'localfs') || req.dig('arguments', 'localfsMap')
-          @is_launch = true
+          @nonstop = true
 
         when 'attach'
           send_response req
           UI_DAP.local_fs_map_set req.dig('arguments', 'localfs') || req.dig('arguments', 'localfsMap')
-          @is_launch = false
+
+          if req.dig('arguments', 'nonstop') == true
+            @nonstop = true
+          else
+            @nonstop = false
+          end
 
         when 'configurationDone'
           send_response req
 
-          if @is_launch
+          if @nonstop
             @q_msg << 'continue'
           else
             if SESSION.in_subsession?