Pivot implementation and redesign (#69)

- Pivot support implementation 
- Rename queries into inquiries
- Rename editor into workspace
- Change result set format
- New JSON format for inquiries
- Redesign panels

tests/views/Main/Workspace/Editor.spec.js

@@ -0,0 +1,23 @@
+import { expect } from 'chai'
+import { mount } from '@vue/test-utils'
+import actions from '@/store/actions'
+import Vuex from 'vuex'
+import Workspace from '@/views/Main/Workspace'
+
+describe('Workspace.vue', () => {
+  it('Creates a tab with example if schema is empty', () => {
+    const state = {
+      db: {},
+      tabs: []
+    }
+    const store = new Vuex.Store({ state, actions })
+    mount(Workspace, { store })
+
+    expect(state.tabs[0].query).to.include('Your database is empty.')
+    expect(state.tabs[0].tempName).to.equal('Untitled')
+    expect(state.tabs[0].name).to.equal(null)
+    expect(state.tabs[0].viewType).to.equal('chart')
+    expect(state.tabs[0].viewOptions).to.equal(undefined)
+    expect(state.tabs[0].isSaved).to.equal(false)
+  })
+})