Add button to show all log lines

Currently with large logs it takes many clicks to be able to see the
entire log file or the top of the log file.

This button displays all log lines with one click.

src/views/Build.vue

@@ -128,6 +128,12 @@
           <div class="output-content" ref="outputContent" @scroll="onOutputContentScroll">
             <Loading v-if="logsShowState === 'loading'"/>
 
+            <div class="output-content-actions" v-if="moreCount">
+              <Button size="l" outline borderless class="output-button" @click.native="handleAll">
+                Show all lines
+              </Button>
+            </div>
+
             <div class="output-content-actions" v-if="moreCount">
               <Button size="l" outline borderless class="output-button" @click.native="handleMore">
                 Show {{Math.min(moreCount, logStep)}} lines more
@@ -337,6 +343,9 @@ export default {
     handleMore: function() {
       this.logLimit += this.logStep;
     },
+    handleAll: function() {
+      this.logLimit = this.logs.length;
+    },
     toggleOutputFullscreen() {
       this.outputFullscreen = !this.outputFullscreen;