Add circular progress on gcode upload

                      <v-layout row>

                        <v-btn disabled><v-progress-circular indeterminate></v-progress-circular><v-icon>mdi-help-network</v-icon>Recherche d'un Slicer en ligne</v-btn>

                        <v-file-input @change="gcode_changed" id="file" justify="left" prepend-icon="mdi-upload-network"  dense small placeholder="Upload GCODE"></v-file-input>

                        <v-progress-circular :value="gcode_upload_progress" :v-show="is_uploading_gcode">{{ gcode_upload_progress }}</v-progress-circular>

                      </v-layout>

                    </v-container>

                  <!-- <v-btn color="primary" @click="e1 = 3">remove this button</v-btn> -->

    stepper_color (s) {

      return this.stepper_step > s ? 'green' : 'blue'

    },

    gcode_changed () {

      this.is_uploading_gcode = true

      let req_id = parseInt(this.id)

      var formData = new FormData();

      formData.append("file", document.querySelector('#file').files[0]);

      axios.post(`/files/gcode/upload/${req_id}`, formData, {

          headers: {

            'Content-Type': 'multipart/form-data'

          },

          onUploadProgress: function(progressEvent) {

            var percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total)

            this.gcode_upload_progress = percentCompleted

          }

      }).then((resp) => {

        this.is_uploading_gcode = false

        this.$store.dispatch('reload_request', this.id).then(() => {

          this.reload()

          console.log(resp)

    return {

      queue: null,

      gcode_upload_progress: 0,

      is_uploading_gcode: false,

      position: -1,

      title: '',

      fullname: '',