Project refactor, add anthropic API support

- Split pkg/cli/cmd.go into new pkg/cmd package
- Split pkg/cli/functions.go into pkg/lmcli/tools package
- Refactor pkg/cli/openai.go to pkg/lmcli/provider/openai

Other changes:

- Made models configurable
- Slight config reorganization

pkg/cmd/remove.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"fmt"
+	"strings"
+
+	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"github.com/spf13/cobra"
+)
+
+func RemoveCmd(ctx *lmcli.Context) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "rm <conversation>...",
+		Short: "Remove conversations",
+		Long:  `Remove conversations by their short names.`,
+		Args: func(cmd *cobra.Command, args []string) error {
+			argCount := 1
+			if err := cobra.MinimumNArgs(argCount)(cmd, args); err != nil {
+				return err
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var toRemove []*model.Conversation
+			for _, shortName := range args {
+				conversation := cmdutil.LookupConversation(ctx, shortName)
+				toRemove = append(toRemove, conversation)
+			}
+			var errors []error
+			for _, c := range toRemove {
+				err := ctx.Store.DeleteConversation(c)
+				if err != nil {
+					errors = append(errors, fmt.Errorf("Could not remove conversation %s: %v", c.ShortName.String, err))
+				}
+			}
+			if len(errors) > 0 {
+				return fmt.Errorf("Could not remove some conversations: %v", errors)
+			}
+			return nil
+		},
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			compMode := cobra.ShellCompDirectiveNoFileComp
+			var completions []string
+		outer:
+			for _, completion := range ctx.Store.ConversationShortNameCompletions(toComplete) {
+				parts := strings.Split(completion, "\t")
+				for _, arg := range args {
+					if parts[0] == arg {
+						continue outer
+					}
+				}
+				completions = append(completions, completion)
+			}
+			return completions, compMode
+		},
+	}
+	return cmd
+}