refactor(cc-dark-theme): organize styles in several files

Until now we had a single file for the dark theme styles with ~2500
lines, with several sections which were marked with CSS comments.

This CL separates this file into several ones to improve its
maintainability, using the folder structure suggested by
https://sass-guidelin.es/#architecture.

Fixed: twpowertools:21
Change-Id: I0c1741f58b470085c0a499b32aa64feb43d8ad31
diff --git a/src/ccDarkTheme/components/inputs/_switch.scss b/src/ccDarkTheme/components/inputs/_switch.scss
new file mode 100644
index 0000000..4d1f61d
--- /dev/null
+++ b/src/ccDarkTheme/components/inputs/_switch.scss
@@ -0,0 +1,15 @@
+.mdc-switch:not(.mdc-switch--checked) .mdc-switch__track {
+  background-color: #7d7d7d!important; /* custom value */
+}
+
+.mdc-switch:not(.mdc-switch--checked) .mdc-switch__thumb {
+  border-color: #fff!important; /* custom value */
+}
+
+.mdc-switch.mdc-switch--checked .mdc-switch__track {
+  background-color: var(--TWPT-blue-A100)!important;
+}
+
+.mdc-switch.mdc-switch--checked .mdc-switch__thumb {
+  border-color: var(--TWPT-blue-A100)!important;
+}