Restructure source and resource files (#46)

importantly, res is now res/res and css is now res/css

src/dialogs/token.cpp

@@ -0,0 +1,43 @@
+#include "token.hpp"
+
+std::string trim(const std::string& str) {
+    const auto first = str.find_first_not_of(' ');
+    if (first == std::string::npos) return str;
+    const auto last = str.find_last_not_of(' ');
+    return str.substr(first, last - first + 1);
+}
+
+TokenDialog::TokenDialog(Gtk::Window &parent)
+    : Gtk::Dialog("Set Token", parent, true)
+    , m_layout(Gtk::ORIENTATION_VERTICAL)
+    , m_ok("OK")
+    , m_cancel("Cancel")
+    , m_bbox(Gtk::ORIENTATION_HORIZONTAL) {
+    set_default_size(300, 50);
+    get_style_context()->add_class("app-window");
+    get_style_context()->add_class("app-popup");
+
+    m_ok.signal_clicked().connect([&]() {
+        m_token = trim(m_entry.get_text());
+        response(Gtk::RESPONSE_OK);
+    });
+
+    m_cancel.signal_clicked().connect([&]() {
+        response(Gtk::RESPONSE_CANCEL);
+    });
+
+    m_bbox.pack_start(m_ok, Gtk::PACK_SHRINK);
+    m_bbox.pack_start(m_cancel, Gtk::PACK_SHRINK);
+    m_bbox.set_layout(Gtk::BUTTONBOX_END);
+
+    m_entry.set_hexpand(true);
+    m_layout.add(m_entry);
+    m_layout.add(m_bbox);
+    get_content_area()->add(m_layout);
+
+    show_all_children();
+}
+
+std::string TokenDialog::GetToken() {
+    return m_token;
+}