Object properties are strong by default, and primitive ones are assign by default. Verbosity is nice, but in this case it introduces unnecessary cognitive load.
Remove all usage of `strong` and `assign` property attributes
* [DarkMode] Migrate existing colors to semantic colors
* This commit introduces FLEXColor that defines the semantic colors
* This migrates most, not all, of the spots that need dynamic colors
* [DarkMode] Use dynamic color providers for iOS13+
* This colorWithDynamicProvider API is intentionally scoped only
to handle light and dark mode (and not handling contrast, level,
weight, etc to keep things simple
* [DarkMode] Remove last reference for scrollViewGrayColor
* [DarkMode] Rename backgroundColor* to systemBackgroundColor*
* This matches more closely with iOS13 UI element color naming scheme
* [DarkMode] Update network history rows to support dark mode
* [DarkMode] Update network history cell text color