Squashed commit of the following:

commit 62e7cb88f4
Author: Gisle Aune <dev@gisle.me>
Date:   Mon Feb 28 22:52:06 2022 +0100

    refactor color system to be separate from models, also move errors out of models.

commit df865574bf
Author: Gisle Aune <dev@gisle.me>
Date:   Mon Feb 21 19:27:42 2022 +0100

    rework color system and make it work with drivers.

internal/lerrors/errors.go

@@ -0,0 +1,33 @@
+package lerrors
+
+import "errors"
+
+var ErrNotFound = errors.New("not found")
+var ErrInvalidName = errors.New("invalid name")
+var ErrBadInput = errors.New("bad input")
+var ErrBadColor = errors.New("bad color")
+var ErrInternal = errors.New("internal")
+var ErrUnknownColorFormat = errors.New("unknown color format")
+var ErrUnknownDriver = errors.New("unknown driver")
+
+var ErrMissingToken = errors.New("driver is missing authentication information")
+var ErrIncorrectToken = errors.New("driver is not accepting authentication information")
+var ErrUnexpectedResponse = errors.New("driver api returned unexpected response (wrong driver selected?)")
+var ErrBridgeSearchFailed = errors.New("bridge search failed")
+var ErrAddressOnlyDryRunnable = errors.New("this address may only be used for a dry run")
+var ErrCannotForwardRequest = errors.New("driver is not able to forward requests")
+var ErrCannotForget = errors.New("forget not supported on this bridge type")
+
+var ErrInvalidAddress = errors.New("invalid mac address")
+var ErrPayloadTooShort = errors.New("payload too short")
+var ErrInvalidPacketSize = errors.New("invalid packet size")
+var ErrReadTimeout = errors.New("read timeout")
+var ErrUnrecognizedPacketType = errors.New("packet type not recognized")
+var ErrBridgeRunningRequired = errors.New("this operation cannot be performed when bridge is not running")
+
+var ErrSceneInvalidInterval = errors.New("scene interval must be 0 (=disabled) or greater")
+var ErrSceneNoRoles = errors.New("scene cannot have zero rules")
+var ErrSceneRoleNoStates = errors.New("scene rule has no states")
+var ErrSceneRoleUnsupportedOrdering = errors.New("scene rule has an unsupported ordering")
+var ErrSceneRoleUnknownEffect = errors.New("scene rule has an unknown effect")
+var ErrSceneRoleUnknownPowerMode = errors.New("scene rule has an unknown power mode")