feat: enable running on NixOS (#1166)

Allows the console be built and run on NixOS. I could not get the
WebView to work and attempting to load it would cause the process to
crash, so additional work was needed to avoid loading it altogether.

Basic usage on NixOS:

```
nix-shell
cargo make run
```

resources/SolutionTab.qml

@@ -57,7 +57,15 @@ MainTab {
             SolutionTabComponents.SolutionVelocityTab {
             }
 
-            SolutionTabComponents.SolutionMapTab {
+            Rectangle {
+                width: parent.width
+                height: parent.height
+                Loader {
+                    sourceComponent: Globals.enableMap ? solutionMap : null
+                }
+            }
+
+            property Component solutionMap: SolutionTabComponents.SolutionMapTab {
             }
         }
     }

shell.nix

@@ -0,0 +1,56 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+(pkgs.buildFHSUserEnv {
+  name = "swift-toolbox";
+  targetPkgs = pkgs: (with pkgs;
+    [ imagemagick
+      libxcrypt-legacy
+      glib
+      capnproto
+      openssl
+      pkg-config
+      cmake
+      clang
+      libglvnd
+      libxkbcommon
+      nss
+      nspr
+      wayland
+      fontconfig
+      freetype
+      expat
+      alsa-lib
+      dbus
+      libkrb5
+      zlib
+      gdb
+    ]) ++ (with pkgs.xorg;
+    [ libX11
+      libXcursor
+      libXrandr
+      libxkbfile
+      libXcomposite
+      libXdamage
+      libXext
+      libXfixes
+      libXrender
+      libXtst
+      libxcb
+      xcbutilkeysyms
+      xcbutilimage
+      xcbutilwm
+      xcbutilrenderutil
+      libXi
+      libxshmfence
+    ]);
+  profile = ''
+    unset QT_QPA_PLATFORMTHEME
+    unset QT_STYLE_OVERRIDE
+    unset QTWEBKIT_PLUGIN_PATH
+    unset QT_PLUGIN_PATH
+
+    export PKG_CONFIG_PATH="${pkgs.openssl.dev}/lib/pkgconfig"
+    export LIBCLANG_PATH="${pkgs.llvmPackages_11.libclang.lib}/lib"
+  '';
+  runScript = "bash";
+}).env

swiftnav_console/main.py

@@ -148,8 +148,6 @@
     settings_rows_to_dict,
 )
 
-from .solution_map import SolutionMap
-
 from .solution_position_tab import (
     SolutionPositionModel,
     SolutionPositionPoints,
@@ -261,6 +259,7 @@
 capnp.remove_import_hook()  # pylint: disable=no-member
 
 MAP_ENABLED = [False]
+SolutionMap = QObject
 
 
 class BackendMessageReceiver(QObject):  # pylint: disable=too-many-instance-attributes
@@ -493,12 +492,10 @@ def _process_message_buffer(self, buffer):
                 up = m.statusBarStatus.ntripUpload
                 down = m.statusBarStatus.ntripDownload
                 down_units = "B/s"
-
                 if down >= 1000:
                     down /= 1000
                     down = round(down, 1)
                     down_units = "KB/s"
-
                 connected = m.statusBarStatus.ntripConnected
                 if connected:
                     data[Keys.NTRIP_DISPLAY] = f"{up}B/s ⬆ {down}{down_units} ⬇"
@@ -798,6 +795,12 @@ def main(passed_args: Optional[Tuple[str, ...]] = None) -> int:
     QQuickStyle.setStyle("Material")
     # We specifically *don't* want the RobotoCondensed-Bold.ttf font so we get the right look when bolded.
 
+    if MAP_ENABLED[0]:
+        global SolutionMap  # pylint: disable=global-statement
+        from .solution_map import SolutionMap as SolutionMap_  # pylint: disable=import-outside-toplevel
+
+        SolutionMap = SolutionMap_  # type: ignore
+
     qmlRegisterType(ConnectionData, "SwiftConsole", 1, 0, "ConnectionData")  # type: ignore
     qmlRegisterType(AdvancedImuPoints, "SwiftConsole", 1, 0, "AdvancedImuPoints")  # type: ignore
     qmlRegisterType(AdvancedMagnetometerPoints, "SwiftConsole", 1, 0, "AdvancedMagnetometerPoints")  # type: ignore