Fix parameter type

data/effects/typewriter.xml

@@ -3,13 +3,13 @@
     <name>TypeWriter</name>
     <description>Typewriter effect v0.3.3</description>
     <author>Rafal Lalik</author>
-    <parameter type="int" name="step_length" min="1" max="240" default="25">
+    <parameter type="double" name="step_length" min="1" max="240" default="25">
         <name>Frames step</name>
     </parameter>
-    <parameter type="int" name="step_sigma" max="20" min="0" default="0">
+    <parameter type="double" name="step_sigma" max="20" min="0" default="0">
         <name>Sigma</name>
     </parameter>
-    <parameter type="int" name="random_seed" min="0" max="100" default="0">
+    <parameter type="double" name="random_seed" min="0" max="100" default="0">
         <name>Random Seed</name>
     </parameter>
     <parameter type="list" name="macro_type" default="1" paramlist="1;2;3;0">